Ms. Maple is considering two securities, A and B, and the relevant information is given below:

State of the economy	Probability	Return on A(%)	Return on B(%)
Bear	0.4	3	6.5
Bull	0.6	15	6.5

Part A: Calculate expected return and standard deviation of two securities.

Part B: Suppose Miss Maple invested $2,500 in security A and $3,500 in security B. Calculate the expected return and standard deviation of her portfolio.

PLEASE SHOW FORMULAS AND CALCULATIONS . THANK YOU.