The Class Marks of a Frequency Distribution Are : 15, 25, 35, 45, 55, 65 and 75. Determine the Class Limits. - Mathematics

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Sum

The class marks of a frequency distribution are: 15, 25, 35, 45, 55, 65 and 75. Determine the class limits.

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Solution

The class marks are uniformly spread.
The class size is the difference between anty two consecutive class marks.
Class size
= 25 - 15
= 10
The lower limit of the first class 

= `15 - (10)/(2)`

= 15 - 5
= 10
The upper limit of the first class

= `15 + (10)/(2)`

= 15 + 5
= 20
Thus, the first class interval is 10 - 20
Similarly, we can find the class limits of all the class marks given.

Class Marks Class limits
15 10 - 20
25 20 - 30
35 30 - 40
45 40 - 50
55 50 - 60
65 60 - 70
75 70 - 80
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Chapter 22: Statistics - Exercise 22.1

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Frank Class 9 Maths ICSE
Chapter 22 Statistics
Exercise 22.1 | Q 10

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