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Question

# For a grouped frequency table there are 5 class-intervals. The fourth and fifth class intervals are '35 - 40' and '40 - 45' respectively. Find the first class interval.

A
20 - 25
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B
15 - 20
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C
5 - 10
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D
25 - 30
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Solution

## The correct option is A 20 - 25There are 5 classes. The fifth class-interval = (40 - 45) The fourth class-interval = (35 - 40) From the given classes we can find the class-size as 5. Class-Size = Upper class limit-Lower class limit = 40-35 = 5 The third class-interval = (35-5 , 35) = (30- 35) The second class-interval = (30-5, 30) = (25- 30) The first class-inteval = (20-25, 25) = (20 - 25)

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