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Introduction to Statistics

Mean of the f...

Question

Mean of the following frequency distribution is
Class 0-5 5-10 10-15 15-20 20-25
Frequency 2 4 8 6 10

A

15.5

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B

16.5

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C

14.5

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D

13.5

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Solution

The correct option is C $15.5$

Class

Frequency(f)

Class Mark (x)

fx

0-5

2

2.5

5

5-10

4

7.5

30

10-15

8

12.5

100

15-20

6

17.5

105

20-25

10

22.5

225

Total

30

465

Mean $= \frac{\sum f x}{\sum f} = \frac{465}{30} = 15.5$

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