A small-business owner must hire seasonal workers as the need arises. The...

...following list shows the number of ? employees hired monthly for a 5-month period.

4, 13, 5, 6, 9

If the mean of these data is approximately 7, what is the population standard deviation for these data? Round the answer to the nearest tenth.

A. 3.3
B. 7.4
C. 10.8
D. 13.5

Please answer some of my following or previous questions about other math problems! best answer = 10 points

PS. Showing how you got your answer (your work) makes you more likely to win the best answer.
 
Let be X: employees hired monthly for a 5-month period

Xmean = (4+13+5+6+9)/(5.) = 7.4

S^2(X) = (4^2+13^2+5^2+6^2+9^2-5*7.4^2)/(4.) = 13.3

SDx = sqrt(13.3) = 3.646916506 A
 
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