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Calculate the standard deviation of 30, 29, 25, 28, 32 an...

Calculate the standard deviation of 30, 29, 25, 28, 32 and 24.

A.

2.0

B.

2.8

C.

3.0

D.

3.2

Correct answer is B

x xμ (xμ)2
24 -4 16
25 -3 9
28 0 0
29 1 1
30 2 4
32 4 16
= 168   46

μ=24+25+28+29+30+326=1688=28

S.D=(xμ)2n=466

= 7.67