you are given the following data on several stock

state of the economy profitability stock return

A B C

boom 25% 40% 24% 20%

expansion 50% 12% 10% 12%

recession 25% -20% -12% 40%

a. calculate the expected return, standard deviation and variance of each stock

b. do the terms "standard deviation and beta" mean the same? why or why not?