Managing the risk of returns is critical to the survival of a hedge-fund manager. The probability distribution of the returns (x_i) next year in millions of dollars is given below. Find the standard deviation of the investment return for the hedge-fund.

xip(xi)

-100.18

-50.10

00.12

50.28

100.32

A.2.30

B.7.363

C.7.563

D.59.5

E.None of the above