Financial analysts have estimated the returns on shares of the Goldday Corporation and the overall market portfolio under two economic states nature as follows. For Goldday the state dependent returns are-0.06in recession, and0.08in an economic boom. For the market the state dependent returns are-0.06in recession,and0.18in boom. The analyst estimates that the probability of a recession is0.50while the probability of an economic boom is0.50.

Compute the standard deviation of the market.