- Answered: The lower boundary of a modal class | bartleby The lower boundary of a modal class with size 15 is 40.The frequency of this class is 7.Find the mode if the frequency of the classes preceeding and succeeding the model class are 3 and 6 respectivel
- The second class has a lower class boundary of 30.5 and an upper class boundary of 35.5. The third class has a lower class boundary of 35.5 and an upper class boundary of 40.5. And so on. Example 2: Calculating Class Boundaries. Suppose we have the following frequency distribution: Use the following steps to calculate the class boundaries: 1
- how do u find the lower limit of the modal class? Asked by vshrikanth | 25th Aug, 2010, 12:00: AM. Expert Answer: The following simple example will help to understand quickly, Examples for Mode of a Grouped Data: Find the mode of a following grouped data. Class interval (C. I) 10-15. 15-20. 20-25. 25-30. 30-35. Frequency (fi) 4. 6
- The class corresponding to which the frequency is 37 is 1900-2100. So, 1900-2100 is the modal class. Here, is the lower class boundary of the modal class. is the frequency of the modal class. is the frequency corresponding to the class next to the modal class, i.e. 2100-2300. is the frequency of the class previous to the modal class, i.e. 1700.

What is the Lower Limit of the Modal Class of the Following Frequency Distribution? Age (In Years) 0 - 10 10- 20 20 -30 30 - 40 40 -50 50 - 60 Number of Patients 16 13 6 11 27 1 L is the lower class boundary of the group containing the median n is the total number of data B is the cumulative frequency of the groups before the median group G is the frequency of the median grou This video screencast was created with Doceri on an iPad. Doceri is free in the iTunes app store. Learn more at http://www.doceri.co It depends whether your variable is discrete or continuous . A discrete variable can only have certain values, whole numbers in your case. Think of number of students in a certain course. If this is the case the class goes from 40 to 59, and the class midpoint will be 49.5 A continuous variable can have any value. Think of age, where 59 may mean 60 minus one minute In this case the.

l = lower limit of the modal class, h = size of the class interval (assuming all class sizes to be equal), f 1 = frequency of the modal class, f 0 = frequency of the class preceding the modal class Class boundaries are the numbers used to separate classes. The size of the gap between classes is the difference between the upper class limit of one class and the lower class limit of the next class. In this case, gap = 21.83−21.82 = 0.01 gap = 21.83 - 21.82 = 0.01. gap = 0.01 gap = 0.0 Write the steps to calculate the mean and modal class of the data. Step 1: Calculate the class boundaries as the class limits must be continuous. Subtract 0.05 units from the lower class limit to get the lower class boundary and add 0.05 units to the upper class limit to get the upper class boundary Case I: Finding the mode Here, the maximum class frequency is 23 and the class corresponding to frequency is 35-45. So, the modal class is 35-45 To find the class limits, set the smallest value as the lower class limit for the first class. Then add the class width to the lower class limit to get the next lower class limit. Repeat until you get all the classes. The upper class limit for a class is one less than the lower limit for the next class

Q. In completing the table for getting the median of grouped data, the following data is needed: Frequency, Lower Boundary & _____ By means of the frequency table above, find the class boundaries of the first three classes. For the first class, 300 - 399 The lower class boundary is the midpoint between 299 and 300, that is 299.5 The upper class boundary is the midpoint between 399 and 400, that is 399.5 For the second class, 400 - 49 **Find** **the** difference between the upper limit of the median **class** and **lower** limit of the **modal** class.(you can take any example to teach) asked Jan 30 in Statistics by Sumit DHOUNDIYAL ( 15 points) **class**-1

A histogram lists the classes along the x-axis of a graph and uses bars to represent the frequency of each class along the y-axis. Each bar is centered at its class midpoint. The following histogram provides a visual representation of the data in the previous frequency table: Notice how each bar is centered at its class midpoint The formula for computing the mode of the grouped data when all classes have the same width is given below: Here: refers to the lower limit of the modal class. represents the absolute frequency of the modal class. the absolute frequency immediately after the modal class. refers to the class width of the modal class. Note: the modal class. * The class width is the difference between the upper or lower class limits of consecutive classes*. All classes should have the same class width. In this case, class width equals to the difference between the lower limits of the first two classes. w=15−12. Simplify to find that the class width is 3 To find the boundary, you will subtract the upper class limit of the lower class from the lower class limit of the upper class, then divide the answer... See full answer below. Become a member and.. The size of the gap between classes is the difference between the upper class limit of one class and the lower class limit of the next class. In this case, gap = 50−49 = 1 gap = 50 - 49 = 1. gap = 1 gap = 1 The lower boundary of each class is calculated by subtracting half of the gap value 1 2 = 0.5 1 2 = 0.5 from the class lower limit

- Click hereto get an answer to your question ️ The modal class of the following frequency distribution is..Class0 - 1010 - 2020 - 3030 - 4040 - 50Frequency 7 15 13 17 1
- lower boundary . of class mode. is the difference between the frequency of class mode . and the frequency of the class . before . the class mode. is the difference between the frequency of class mode and the frequency . of the class . after . the class mode. i . is the class widt
- IBDP Maths Studies upper and lower class boundaries. IBDP Maths Studies upper and lower class boundaries
- Definition: Class Boundary When we have different classes of data, there is always an upper and a lower class limit for it i.e. the dataset has a smallest and largest value. Class boundary is the midpoint of the upper class limit of one class and the lower class limit of the subsequent class
- · In order for the classes to actually touch, then one class needs to start where the previous one ends. This is known as the class boundary. To find the class boundaries, subtract 0.5 from the lower class limit and add 0.5 to the upper class limit.Sometimes it is useful to find the class midpoint
- L is the lower class boundary of modal class. fm is the Frequency of the model class. f1 is the previous frequency of the model class. f2 is the next frequency of the model class. h is the size of model class i.e. difference between upper and lower class boundaries of model class. Model class is a class with the maximum frequency
- Class-interval of this cumulative frequency is the median class-interval. Step 3 : Find out the frequency f and lower limit l of this median class. Step 4 : Find the width h of the median class interval Step 5 : Find the cumulative frequency C of the class preceding the median class. Step 6 : Apply the formula

Let's take a look at some examples that involve finding the modal class from a grouped frequency table. Example 1. The frequency table shows the weights of some patients a doctors surgery. 13 people have a weight 60kg up to 70kg, 2 people have a weight 70kg up to 75kg, 45 people have a weight 75kg up to 95kg and 7 people have a weight 95 up to 100kg * Where, ℓ: lower boundary of modal class (modal class is the class with highest frequency) f: frequency of the modal class f 0: frequency preceding to modal class f 2: frequency succeeding to modal class w: width of modal class Note 1: To calculate Mode in case of continuous frequency distribution the class intervals should be of Exclusive type*. Note 2: If any one (or more) of the following.

Find the modal class. The modal class is the class interval that has the largest frequency. Find the lower class boundary of the modal class Find the difference of frequency between the modal class to its upper class (). Find the difference of frequency between the modal class to its lower class (). Add the to products by , then add it to . Mode L= lower class boundary of the modal group. f . 1 = frequency of the modal group. f . 0 = frequency of the class preceding or just before the modal class. f . 2 = frequency of the class succeeding or just after the modal class. w= group width. mode = 8000+ 2×300−240−50. 300−240 ×2000. mode= 8000+387.096. mode = 8387.096. mode = 835 Calculation of class boundaries for three class intervals can be illustrated with the help of following figure. The figure shows two methods for calculating the class boundaries. In the first method, class boundaries are calculated by adding the upper class limit of upper class to the lower class limit of next class divided by 2 Click hereto get an answer to your question ️ Find the sum of lower limit of the modal class and upper limit of modal class from the following frequency distribution table for the given data:ClassFrequency 10 - 20 1 20 - 30 3 30 - 40 5 40 - 50 9 50 - 60 7 60 - 70

In a frequency distribution, each class has a lower class limit, which is the least number that can belong to the class, and an upper class limit, which is the greatest number that can belong to the class. Also, class boundaries are the numbers that separate classes without forming gaps between them. For data that are integers, subtract 0.5. We can use this formula to find the mode for Grouped data. In the example above modal class is 60-80. where l = lower limit of the modal class, h = size of the class interval (assuming all class sizes to be equal), f 1 = frequency of the modal class, f 0 = frequency of the class preceding the modal class We find the class boundaries, midpoints, and widths for each class using the below formulae: The class boundaries should have one additional place value and end in a 5. The class width for a class in a frequency distribution is found by subtracting the lower (or upper) class limit of one class from the lower (or upper) class limit of the next.

L is the lower class boundary of the modal group f m - 1 is the frequency of the group before the modal group f m is the frequency of the modal group f m + 1 is the frequency of the group after the modal group w is the group width As we know we can have more than one mode , So find mode for each modal class and all the mode are correct solution. From this article, you can easily learn and understand the concept of mode of numbers. Because we have compiled the basic fundamentals of mode like definition, formula, how to find the mode value from the given data set, and a handy tool to calculate the modal value in a short span of time. The name of the tool is Mode Calculator **The** mode of a list of data values is simply the most common value (or values if any). When data is grouped (binned) as in a histogram, we normally talk only about the **modal** **class** (**the** **class**, or group, with the greatest frequency), because we don't know the individual values. But some sources teach a formula for finding (actually just estimating) the mode * L = lower boundary of the median class N = total frequency C = cumulative frequency of the class preceding the median class f = frequency of the median class w = width of the median class i*.e. upper boundary - lower boundary Note 3: If we consider the interval 20-30 as the median class and use the above formula, then the median will b

In statistics the class boundaries are numbers that separate classes without forming gaps. To find the lower, you subtract 0.5 and to find the upper, you add 0.5. If the class is 3-7 the lower. Class Boundary : Class Boundary is the number used to separate the two different classes. It is the midpoint between the upper class limit of a class and the lower class limit of the next class. Each class have both upper and lower limit boundary In order for the classes to actually touch, then one class needs to start where the previous one ends. This is known as the class boundary. To find the class boundaries, subtract 0.5 from the lower class limit and add 0.5 to the upper class limit. Sometimes it is useful to find the class midpoint. The process i Find the difference between the upper limit of the median class and lower limit of the modal class.(you can take any example to teach) asked Jan 30 in Statistics by Sumit DHOUNDIYAL ( 15 points) class-1

Here, the lower boundary of the median class would be 79.5, which is 0.5 below the lower limit, 80. (Note that the word boundary is used in both statements of the formula above.) I didn't take this distinction into account in my answer to Pramod; and his work suggests that he is in fact assuming continuous (real number) data The upper class boundary is the midpoint between 599 and 600, that is 599.5 Class Intervals, width and size Class interval for example is 300-399 and the class width or size is the difference between the upper and lower class boundaries of any class.Example: Class Frequency 300 - 399 13 400 - 499 20 500 - 599 7 600 - 699 Class limits have the same accuracy as the data values; the same number of decimal places as the data values. Class boundaries. They are halfway points that separate the classes. The lower class boundary of a given class is obtained by averaging the upper limit of the previous class and the lower limit of the given class To find the upper limit of the first class, subtract one from the lower limit of the second class. Then continue to add the class width to this upper limit to find the rest of the upper limits. Find the boundaries by subtracting 0.5 units from the lower limits and adding 0.5 units from the upper limits. The boundaries are also half-way between. (ii) Locate the modal class, pre-modal class and post-modal class . (iii) Join the right-hand top vertices of the modal class (C) and pre-modal class (a) by a straight line . (iv) Join the left-hand top vertices of the modal class (B) and post-modal class (D) by a straight line . (v) Let the point of intersection of AC and BD be E

* Multiply this proportion by the class width and add it to the lower boundary of the median class*. Mode. The mode is the most frequent data value. There may be no mode if no one value appears more than any other. There may also be two modes (bimodal), three modes (trimodal), or more than three modes (multi-modal) So the class width — notice that for each of these bins (which are each of the bars that you see here), you have lower class limits listed here at the bottom of your graph. So 110 is the lower class limit for this first bin, 130 is the lower class limit for the second bin, 150 is the lower class limit for this third bin, so on and so forth (ii) If the classes are of EQUAL CLASS WIDTH, identify the modal class (class with highest frequency) and estimate the mode using the formula. c fa f fb f fb f L Mode where L = lower class boundary of modal class f = frequency of modal class fb = frequency of class before modal class fa = frequency of class after modal class c = class width of modal class (iii) If the classes are of UNEQUAL. This is the interval between two consecutive upper (or lower) class limits. Frequency Distribution DRAFT. 9th - 12th grade. 20 times. Find the class boundaries. answer choices . 21, 31, 41, 51, 61, 70, 80. A table that shows classes or intervals of data entries with a count of the number of entries in each class How can we find the median if total number of observation is 50 The difference between the highest and the lowest observations in a data is its A. frequency B. width C. range D. mode how to find missing frequency in median How is median class selected? Can a median of a given data be zero

- According to Professor James Jones of Richland Community College, the modal class in statistics, commonly called the mode, is the raw data unit that occurs most often within a data set. This is a part of descriptive statistics, as it is the frequency of data
- D) find the range 2) The lower class limit represents the smallest data value that can be included in the class. 2) A) False B) True SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 3) When data are collected in original form, they are called . 3) 4) The of a specific class is the number of data.
- 10 LCBDi=the lower class boundary of the Dith class c =class size of the Dith class fDi =frequency of the Dith class <cfDi-1=less than cumulative frequency of the class preceding the Dith class Example: (Refer to the example on the scores of 100 students in an achievement test) Find the 8th Decile
- > In short, class interval is nothing but the difference between class boundaries Class boundary Class boundary is the midpoint of the upper class limit of one class and the lower class limit of the subsequent class. > Eg: class A 0-9.

- In class boundary, the upper extreme value of the first class interval and the lower extreme value of the next class interval will be equal. To know more about class limit and class boundary, let us look at the frequency distribution of weights of 36 students given below
- In exclusive method of class formation, we add the interval 5 to the lower limit of the lowest class to find the upper limit of the class as 140 + 5 = 145. Thus our lowest class becomes 140 - 145. The remaining class limits and classes are obtained by adding the interval i.e. 5 to each class limit unit we reach the 12th class as 195-200.
- Class 6 (Foundation) Math. Class 6 (Foundation) Course summary; Addition and subtraction. Perimeter: Area and its boundary Counting unit squares to find area: Area and its boundary Area of shapes on grids: Area and its boundary. Boxes and sketches: Area and its boundary. Volume and mass
- imum value is $11,500. Use Sturges' rule to deter
- Ages Number of students 15-18 2 19-22 4 23-26 8 27-30 9 31-34 6 35-38 3Based on the frequency distribution above, is 22.5 a:Class boundary Lower class limit Upper class limit Class width Class midpoin read mor
- There are two for each class. The lower class limit of a class is the smallest data value that can go into the class. The upper class limit of a class is the largest data value that can go into the class. Class limits have the same accuracy as the data values; the same number of decimal places as the data values. Class boundaries

Bar Graph: The pictorial representation of data, in the form of vertical or horizontal rectangular bars. Histogram: A set of rectangles with bases along with the intervals between class boundaries and with areas proportional to frequencies in the corresponding classes. Frequency Polygons: It is used to compare sets of data or to show a cumulative frequency distribution 3. Choose a number for the lower limit of the first class 4. Use the lower limit of the first class and the class width to list the other lower class limits. 5. Enter the upper class limits. 6. Tally the frequency for each class class width (highest value) - (lowest value) number of classes range number of classes 3.Find the class limits: You can use the minimum data entry as the lower limit of the rst class. To get the lower limit of the next class, add the class width. Continue until you reach the last class. Then nd the upper limits of each class (since the classes cannot overlap, an

- How To Find The Mean, Mode And Median From A Frequency Table For Both Discrete And Grouped Data? Mean: multiply midpoints by frequencies and add the sub-totals. Divide by the total of the frequencies. Mode: find the largest frequency - the corresponding value is the modal value or modal class
- Use the given frequency distribution to find the a class width b class midpoints c class boundaries Temperature 0 F Frequency 32 34 1 35 37 3 38 40 5 41 43 11 44 46 7 47 49 7 50 52 1. The class width can be obtained by subtracting the lower class limit of a class from that of a subsequent class..
- and so on. Well one of the questions is that what is the upper class boundary of the first class. I thought that with the first class (1.0 - ) it would be (1.0 - 1.3) if there was a number there as the lower limit, and so the upper class boundary would be 1.35
- The first class contains the numbers 1 through 10. The lower class limit is 1 and the upper class limit is 10. The frequency is the number of values in the class, so there are 5 values in the range 1 to 10.. The class width is the difference between any two successive lower (or upper) limits.All class widths must be the same. In this case the class width is 11 -1 = 10
- e the range of the data, divide the range by the number of classes, and round up to the next convenient number. 3. Find the class limits. You can use the

Where I1 = Lower class boundary of the modal class. I2 = Upper class boundary of the modal class. A distribution having only one mode is called unimodal.If it contains more than one mode, it is called bimodal or multimodal. If however the frequency distribution has classes of unequal width or it contains more than one mode, the above formula. where, l : Lower Boundary of modal class h : Size of modal class f m: Frequency corresponding to modal class f 1: Frequency preceding to modal class f 2: Frequency proceeding to modal class. Parameters : array : Input array or object having the elements to calculate the mode. axis : Axis along which the mode is to be computed. By default axis = Calculating the mean and modal class for grouped data is very similar to finding the mean from an ungrouped frequency table, although you do not have all the information about the data within the.

Find the lower class boundary for the class whose limits are 1 - 10 - 7949481 1. Log in. Join now. 1. Log in. Join now. Ask your question. nataliecat7941 12/27/2017 Mathematics High School +5 pts. Answered Find the lower class boundary for the class whose limits are 1 - 10 Class Boundaries Class boundaries • The numbers that separate classes without forming gaps between them. Larson/Farber 4th ed. 19 Class Class Boundaries Frequency, f 7 - 18 6 19 - 30 10 31 - 42 13 • The distance from the upper limit of the first class to the lower limit of the second class is 19 - 18 = 1. • Half this distance is 0.5 The lower class boundary is the lowest value of the class at witch you are looking. In this case the lower class boundary for the third class is 20.5, the point halfway between the top of the.. Let U be the upper class boundary of a class in a frequency distribution and M be the midpoint of the class. Which one of the following is the lower class boundary of the class? (a) () M ML 2 + + (b) L ML 2 + + (c) 2MU- (d) ML-2 Ans : (c) 2MU-Class mark Upperclassboundary lowerclassboundary 2 = + M UL 2 = + 2MU- 12 50=L 12. The mid-value of a.

Answer: lower limit of median class is 30-40. n/2=35/2=17.5. 17.5 lies on 30-40 class. upper limit of modal class is 20-30. because 13 is highest frequenc The midpoints of each class is calculated by taking average of upper class limit and lower class limit for each class. Class. Interval Midpoints. 45-48 49-52 53-56 57-60 61-64 65-68 69-72 c) Class boundaries are calculated by subtracting 0.5 from the lower class limit and adding 0.5 to the upper class interval. Class. Interval Class boundary. This is what I did for my app. If you take a look at the following classes in the bootstrap.css file .modal-dialog has a default padding of 10px and @media screen and (min-width: 768px) .modal-dialog has a top padding set to 30px In the class 25- 27, the lower boundary is 25 - 0.5 = 24.5 and the upper boundary is 27 + 0.5 = 27.5 2. Cumulative frequency - there are two kinds of cumulative frequency for a class

The mode for grouped data. You can calculate the mode for a grouped frequency table by using the following formula: Where: L is the lower class boundary of the modal class.; f m is the frequency associated with the modal class.; f 1 is the frequency of the class before to the modal class.; f2 is the frequency of the class after the modal class.; h is the difference between the upper and lower. Finding the MEAN involves more working out than finding the Modal Class and Median Class. To find the MEAN (or Mathematically Estimated Average Number), involves adding two extra columns to our original Frequency Table. There are three main steps: 1) Find all of our Interval Midpoints, and write these in the third colum Thus, the modal class is 20 - 30. Lower limit of the modal class (l) = 20. Size of the class interval (h) = 10. Frequency of the modal class (f 1) = 12. Frequency of the class preceding the modal class (f 0) = 5. Frequency of the class succeeding the modal class (f 2)= 8. Substituting these values in the formula we get; Mean Median Mode. Now just add your class width to find the lower bound of subsequent classes (for example, if the lower bound of your first class is 5, and your class width is 5, the lower bound of your second class will be 10, the lower bound of your third class will be 15, and so on)

the median class is the class for which upper class boundary is . In other words, 299.5-399.5 is the median class, i.e. the class containing the median value. using the formula for median we have, Median or where, (lower class boundary of the median class), (total frequency), ( less than type cumulative frequency corresponding to ), (frequency. (i) 20 (ii) 40 (iii) 60 (iv) 80 Modal class is class with highest frequency ∴ 40 − 60 is the modal class And Upper limit = 60 (c) The construction of cummulative frequency table is useful in determining the (i) Mean (ii) Median (iii) Mode (iv) All of the aboveCummulative frequency table is used to find the Median (d) The sum of lower limits. Linear Discriminant Analysis Notation I The prior probability of class k is π k, P K k=1 π k = 1. I π k is usually estimated simply by empirical frequencies of the training set ˆπ k = # samples in class k Total # of samples I The class-conditional density of X in class G = k is f k(x). I Compute the posterior probability Pr(G = k | X = x) = f k(x)π k P K l=1 f l(x)π l I By MAP (the. Apart from the stuff class limit and class boundary, let us look at the mid point of a class interval. Mid Point or Mid Value or Class Mark. Corresponding to a class interval, this may be defined as the total of the two class limits or class boundaries to be divided by 2 If an observation falls on the boundary between two class intervals, we need know in which class interval it will be counted. The two choices are to: (a) include the left boundary and exclude the right boundary or (b) include the right boundary and exclude the left boundary. When faced with this choice, we will use the option a

class with the maximum frequency. This class is known as the modal class . The mode of the data is a value inside the modal class. (ii) Mode of the grouped data can be calculated by using the formula Mode = 1 0 1 0 2 2 f f l h f f f , where l is the lower limit of the modal class, h is the size of the class, f 1 is frequency of the modal class. 3) Find the class boundaries, midpoints, and widths for each class. a) 12 - 18 b) 56 - 74 c) 695 - 705 d) 13.6 - 14.7 e) 2.15 - 3.93 Class Limits Class Boundaries Midpoints Class Width 12 - 18 11.5 - 18.5 12 18 30 15 2 2 7 56 - 74 55.5 - 74.5 56 74 130 65 2 2 19 695 - 705 694.5 - 705.5 695 705 1400 700 2 First, we must find class midpoints. The class midpoint is the average of the lower class limit and upper class limit for that class. For this example, the class midpoints are. Once you have the class midpoints, you can enter numbers in the calculator. Press the STAT and the ENTER buttons to reach the display with L1, L2, L3 across the top classes without forming gaps. To find the lower, you subtract 0.5 and to find the upper, you add 0.5. If the class is 3-7 the lower class boundary would be 2.5 and the upper 7.5. The upper boundary..

Find the modal class. The modal class is 160 ≤ h < 170 as it contains the most values. Also note that when we speak of someone by age, say 8, then the person could be any age from 8 years 0 days up to 8 years 364 days (365 in a leap year!) l reflects the lower limit or class boundary of the median class. F reflects the cumulative frequency of the class before the median class. f represents the frequency of the median class. N represents the total number of observations. h reflects the width of the median class . First, let us calculate the total number of observations from the. All classes should have the same class width. Class Midpoint - The middle value of each data class. To find the class midpoint, average the upper and lower class limits. upper lower class midpoint = 2 + Class Boundaries - The numbers that separate classes without forming gaps between them. Range (of data) - The highest value - the. As @fedda said, you need to specify a z-index on the modal element for it to be over the first one (1050 is the default) and then you have to also set the z-index of the backdrop (everything is darken in the back of the modal) to be over the first one and finally, if your first modal can be scrollable (big modal or small screen), you have to.

Create a table with the columns - Class intervals, Lower limit, Upper limit and Frequency. How to calculate lower and upper limits using excel formula - Suppose class interval column starts from cell E5 (excluding header) An Example Using Class Intervals. Let's find out what this means for the U.S. Census. Individually listing the number of 1-year-old kids, 2-year-old kids, 3-year-old kids, and so on, could be too. Class boundaries will be defined to separate the classes (when graphing) so there are no gaps in the frequency distribution. o Should have one additional decimal place and end in a 5. o The lower boundary will round to the lower class limit. o The upper boundary will round to the next class

Class Width Calculator. The difference between the upper or lower class limits of consecutive classes is the class width. All classes should have the same class width and it is equal to the difference between the lower limits of the first two classes. Use the below online Class width calculator to calculate the Class Width Frequency Distribution Michael Stevenson writes a good explanation of understanding the mechanics of the question. I'll be a little more theoretical to see if I can drive home the point in another manner. (By the way, before I read the comment and that you were in gra..

(5) For the boundaries between classes, use the value which is halfway between the upper class limit of one class and the lower class limit of the next class. So in the above example, the class boundary would be 3.95 and the lowest class would be 3.7-3.95 with the next class being 3.95-4.25 and so on Class midpoints are the midpoints of the classes. Each class midpoint can be found by adding the lower class limit to the upper class limit and dividing the sum by 2. Example 9 - Find the class midpoints for the waist-to-hip ratio example The mean of the following frequency distribution is 62.8. Find the missing frequency x. Class 0-20 20-40 40-60 60-80 80-100 100-120 Frequency 5 8 x 12 7 8 33. Cards numbered from 11 to 60 are kept in a box. If a card is drawn at random from the box, find the probability that the number on the drawn card is (i) an odd number (ii) a perfec You just go halfway between the class limits. BUT Sometimes the class boundaries are a bit confusing. Example: you work with age groups, like: 10-19 20-29 30-39 etc. Then you would be tempted to use the midpoints: 14.5 24.5 34.5 as being halfway between 10 and 19 etc. Untill you realise, that 10-19 actually means 10-19.99... (often written as 10-<20), then the midpoint should be 15

CBSE Class 10 Maths Statistics Notes:-Download PDF HereThe brief notes on statistics for class 10 are given here. In this, we are going to discuss the important statistical concepts, such as grouped data, ungrouped data and the measures of central tendencies like mean, median and mode, methods to find the mean, median and mode, the relationship between them with more examples Class Interval= Upper Class limit - Lower class limit . In statistics, the data is arranged into different classes and the width of such class is called class interval. Class intervals are generally equal in width but this might not be the case always. Also, they are generally mutually exclusive. Class Intervals are very useful in drawing. Each class has a LOWER CLASS LIMIT: the number that can belong to the class. Each class has an UPPER CLASS LIMIT: the number that can belong to the class. The CLASS WIDTH is the distance between lower limits of consecutive classes. The class width of this frequency distribution is: Class Frequency, f 1 5 10 -15 16— 20 25 21- 26- 3 Data values are grouped into classes of equal widths. The smallest and largest observations in each class are called class limits, while class boundaries are individual values chosen to separate classes (often being the midpoints between upper and lower class limits of adjacent classes) Class 0-5 5-10 10-15 15-20 20-25 Frequency 10 15 12 20 9 The sum of lower limits of the median class and the modal class is (a) 15 (b) 25 (c) 30 (d) 35 6. Consider the following frequency distribution: Class 0-9 10-19 20-29 30-39 40-49 Frequency 13 10 15 8 11 The upper limit of the median class is (a) 29 (b) 29.5 (c) 30 (d) 19.5 7