2. The following table represents outcome numbers, probabilities, and associated returns for Stock A:

Outcome (i) Return (Ri) Probability (Pi)

1 05 10 2 15 10 3 05 05 4 15 10 5 15 10 6 10 10 7 15 10 8 05 10 9 15 ?
10 10 10 Thus, there are 10 possible return outcomes for Stock A.

a. What is the probability associated with outcome 9?

b. What is the standard deviation of returns associated with Stock A?