I need the answer to the standard deviation stock A Question.

Problem 13-7 Calculating Returns and Standard Deviations [LO1]

Consider the following information:

				Rate of Return If State Occurs
State of	Probability of
Economy	State of Economy			Stock A			Stock B
Recession		.21			.06			.21
Normal		.58			.09			.08
Boom		.21			.14			.25

Calculate the expected return for each stock. (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.)

	Expected return
Stock A	% 9.42
Stock B	% 5.48

Calculate the standard deviation for each stock. (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.)

	Standard deviation
Stock A	% ?
Stock B	% 15.25