X 13 10 8 9 6 s standard deviation of the X values above Q

X : 13, 10, 8, 9, 6

s = standard deviation of the X values above

Question 12 options:

1.52

2.59

3.39

4.43

X-bar = ( 13 + 10 + 8 + 9+ 6)/5 = 9.2

Sigma(Xi -X-bar)^2 = (13-9.2)^2 + (10-9.2)^2+(8-9.2)^2 + (9-9.2)^2+(6-9.2)^2 = 26.8

Sigma(Xi -X-bar)^2 / (N-1) = 26.8/4 = 6.7

Therefore,

Standard Deviation s = sqrt(6.7) = 2.59 Answer Option B