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Question

Class marks of a distribution are 26, 31, 36, 41, 46, 51, 61, 66, 71. The lower and upper class limits of the first class interval are


A

23.5 - 28.5

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B

20 - 30

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C

41 - 46

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D

30 - 35

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Solution

The correct option is A

23.5 - 28.5


Class marks are uniformly spaced, so the class size is the difference between any two consecutive class marks.

Class size = 31 - 26 = 5

If a is the class interval of size h, then the lower and upper limits of the class interval are a – h/2 and a +h/2

Lower limit of first class interval = 26 – 5/2 = 23.5

And upper limit of first class interval = 26 + 5/2 = 28.5


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