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Age in years 10 - 14 15 - 19 20 - 24 25 - 29 30 - 34
Frequency 6 8 14 10 12

Find the mean of the distribution.

A.

23.4

B.

23.6

C.

24.3

D.

24.6

Correct answer is B

Age in years

Classmark

(x)

Frequency

(f)

fx
10 - 14 12 6 72
15 - 19 17 8 136
20 - 24 22 14 308
25 - 29 27 10 270
30 - 34 32 12 384
Total   50 1170

\(Mean = \frac{\sum fx}{\sum f}\)

= \(\frac{1170}{50} = 23.4\)



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