Question

How to find Class width of a number of class intervals in the frequency distribution table?

Answer 1

How Do I Calculate Class Width?

Find Largest Data Value. Determinethe largest data value in your sample data set. ...

Find Smallest Data Value. Determinethe smallest data value in your set. ...

Subtract Smallest Value From Largest Value. Subtract the smallest data value from the largest data value. ...

Divide Difference by Number of Classes.


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Answer 2

Answer:

Class width can be calculated by subtracting the lower limit from the upper limit of a specific class.

Step-by-step explanation:

Consider a frequency distribution table with a class 23-32.

Here 23 is the lower limit and 32 is the upper limit of that class.

Hence, class width = upper limit - lower limit

i.e., class width = 32 - 23 = 9

In cases when a data set is given, class width can be calculated in a different way.

1. First of all, find the range of data which is calculated as range = largest data - smallest data
2. Divide the range by number of classes to be constructed.
3. Round up the value to the nearest whole number.

Eg. Given data set

20, 36, 57, 16, 39, 43, 48, 24, 55, 31

• Range = largest data - smallest data

        i.e., range = 57 - 16 = 41

• Number of classes taken as 5

        Therefore, dividing range by no. of classes, 41 / 5 = 8.2

• Rounding 8.2 ≅ 9
• Class width = 9