(Related to Checkpoint 7.1) (Expected rate of return and risk)B. J. Gautney Enterprises is evaluating a security. One-year Treasury bills are currently paying percent. Calculate the investment's expected return and its standard deviation. Should Gautney invest in this security?

Probability. Return

.20. -5%

.50 3%

.10 6%

.20 8%

a. The investment's expected return is

2.7%

(Round to two decimal places.

b. The investment's standard deviation is:

(Round to two decimal places.)

I need help calculating the standard deviation, please break down in simplest terms. Thanks!