Investors have made the following forecast about the returns from investing in securities issued by two companies:
	State of the Economy	Probability of this state of the economy	Rate of return from Company X	Rate of return from Company Z
	Boom	5%	19%	51%
	Good times	20%	17%	31%
	Average times	50%	15%	20%
	Bad times	15%	6%	-6%
	Recession	10%	1%	-27%
Required:
	A. Calculate the expected return of each distribution.
	B. Calculate the standard deviation of each distribution.
	C. In terms of total risk, which security is safer?