The width of each of five continuous classes in a frequency distribution is 5 and the lower class limit of the lowest class is 10 What is the upper class limit of the highest class CBSE class 9 Mathematics

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The width of each of five continuous classes in a frequency distribution is 5 and the lower class limit of the lowest class is 10. What is the upper class limit of the highest class? CBSE class 9 Mathematics

NCERT math solution

By:Shivam-Yadav

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Answers

Let x and y be the upper and lower class limit of frequency distribution.

Given, width of the class = 5

x-y= 5 …(i)

Also, given lower class (y) = 10 On putting y = 10 in Eq. (i), we get

x – 10= 5  x = 15 So, the upper class limit of the lowest class is 15.

Hence, the upper class limit of the highest class

=(Number of continuous classes x Class width + Lower class limit of the lowest class)

= 5 x 5+10 = 25+10=35

Hence,’the upper class limit of the highest class is 35.

Alternate Method

After finding the upper class limit of the lowest class, the five continuous classes in a frequency distribution with width 5 are 10-15,15-20, 20-25, 25-30 and 30-35.

Thus, the highest class is 30-35,

Hence, the upper limit of this class is 35.


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