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Question: The number of people of different age groups visiting a recreation club in a town are as shown in the frequency distribution table.
Age groupNumber of people
10 - 159
15 - 2022
20 - 2535
25 - 3028
30 - 3531
35 - 4017

Find the mean of the data.


A ) 26.06
B ) 142
C ) 616.67
D ) 3700

Steps to derive

1 The midpoint of each class (age group) and the product with the frequency is as shown in the table.


2 Mean = 1n ∑ f X = 3700142 = 26.06
 [Use n = ∑ f.]

3 The number of people of different age groups visiting a recreation club in a town has a mean of 26.06.



Hence the right answer is Option A

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