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Find the variance of 11, 12, 13, 14 and 15.

...

Find the variance of 11, 12, 13, 14 and 15.

A.

2

B.

3

C.

2

D.

13

Correct answer is A

Variance(σ2)=(xμ)2n

The mean (μ) of the data = 11+12+13+14+155=655=13

x (xμ) (xμ)2
11 -2 4
12 -1 1
13 0 0
14 1 1
15 2 4
Total   10

σ2=105=2