A data set with whole numbers has a low value of 20 and a high value of 110.

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A data set with whole numbers has a low value of 20 and a high value of 110. Find the class width for a frequency table with seven classes. Find the class limits for a frequency table with seven classes. Lower class limit - Upper class limit First class Second class Third class Fourth class Fifth class Sixth class Seventh class


Solution :

Range = Maximum value - Minimum value

Range = (110 - 20)

Range = 90

Number of classes = 7

Class width = Range / Number of classes

Class width = 90 / 7

Class width = 12.857

On rounding to next integer we get,

Class width = 13


The class limit of the 7 classes will be as follows :

Lower class limit Upper class limit
First class 20 32
Second class 33 45
Third class 46 58
Fourth class 59 71
Fifth class 72 84
Sixth class 85 97
Seventh class 98 110