Do NOT just give me the answer. This is the third time asking for help and paying! The final answer says to take =82.2817^1/2 = 9.23%. However, I put 82.2817^1/2 in excel and get the answer of 42.64. PLEASE show me how to do it in excel in order to get the correct answer of 9.23%.

2. Calculate the expected standard deviation on stock:

State of the economy	Probability of the states	Percentage returns
Economic recession	28%	-9%
Steady economic growth	26%	7%
Boom	Please calculate it	13%

Round the answers to two decimal places in percentage form. (Write the percentage sign in the "units" box)