May 19, 2020

## How can you calculate class interval?

**Class interval** refers to the numerical width of any class in a particular distribution. It is defined as the difference between the upper-class limit and the lower **class** limit.

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 Interval exercise to try

The following data are weights of people on a diet

plan;

{52, 75, 92, 101, 83, 68, 133, 78, 104, 61, 39, 46, 135, 87,

131, 99, 104, 86, 67, 116, 89, 57, 87, 98, 131, 116, 135, 93}

a) With a class interval of 14, determine how many classes you get

b) Presents these weights by use of a frequency distribution table

Did you figure it out? Let us know in the comments

Help me to know how to calculate class interval in statistics for example the class interval is given as 14. How would you solve that?

Me too i did’nt understand why it becomes 14😭

C=(highest-lowest)/no. of groups

*Highest and lowest are given on the tally sheet.

Example:

C= (85-34) / 7

= 51/7

= 7.29

= 7

*Class interval should be a whole number*

But the class interval here is 14

Count the given numerical data….you’ll get the count of 14🙂

Where did you get the 7?

I didn’t understand how it is 14?

The following data are weights of people on a diet

plan; {52, 75, 92, 101, 83, 68, 133, 78, 104, 61, 39, 46, 135, 87,

131, 99, 104, 86, 67, 116, 89, 57, 87, 98, 131, 116, 135, 93}a) With a class interval of

14, determine how many classes you get (4 marks)b) Presents these weights by

use of a frequency distribution table (6 marks)

c) From b)

calculate the average weight (5 marks

Class Interval=Range/No of ClassesHence, No of Classes=Range/Class IntervalRange= Higher No-Lowest No=135-39=96No of Class=96/14=6.85 ClassesHope this will help. Let me know for any further clarification.

Is it right to decide on the number of classes first? If so, then how does one get to the optimal number of classes?

what if class interval is not given? how to get it?

A)14

Will the class interval be given always? If No, how does one calculate for class interval