Find the standard deviation of 2,3,8,10 and 12

A.
3.9 
B.
4.9 
C.
5.9 
D.
6.9
Correct Answer: Option A
Explanation
(begin{array}{cc} x & (x – varkappa) & (x – varkappa)^2 \ hline 2 & 5 & 25 \ hline 3 & 4 & 16 \ hline 8 & 1 & 1 \ hline 10 & 3 & 9 \ hline 12 & 5 & 25 \ hline & & 76
end{array})
S.D = (sqrt{frac{(x – varkappa)^2}{n}})
S.D = (sqrt{frac{76}{5}})
S.D = 3.9
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