compute the expected value, standard deviation and coefficient of variation before the acquisition..

for the answer for standard deviation can you put it in a easy explanation of how you got the answer thanks.

I am going to need step by step explanation plus answer.

Transoceanic Airlines is examining a resort motel chain to add to its operations. Before the acquisition, the normal expected outcomes for the firm were as follows: Recession Normal economy Strong economy Recession Normal economy Strong economy Outcomes ($ millions) After the acquisition, the expected outcomes for the firm would be: Expected value Standard deviation Coefficient of variation $30 50 70 Expected value Standard deviation Coefficient of variation Outcomes ($ millions) After the acquisition these values are as follows: $10 50 100 Probability 0.30 0.40 0.30 SS Probability 0.30 0.40 0.30 a. Compute the expected value, standard deviation, and coefficient of variation before the acquisition. (Enter the answers in millions. Round "Coefficient of varlation" to 3 decimal places. Round "Expected value" and "Standard deviation" to 1 decimal place.) 53.0 ($ millions) 34.9 ($ millions) 658 million million