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Mean

Calculate ave...

Question

Calculate average of the following series:

X : 4 6 10 14 18 22

f : 7 9 16 8 6 4

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Solution

X f fX

4
6
10
14
18
22 7
9
16
8
6
4 28
54
160
112
108
88

Σf = 50 ΣfX = 550

$X = \frac{Σ f X}{Σ f} = \frac{550}{50} = 11$
Thus, the mean is 11.

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