state of economy	probability of economy	security return if states occurs
		Roll	Ross
Bust	0.30	-10%	14%
Boom	0.70	21%	5%

Calculate the standard deviations for Roll and Ross by filling in the following table:

State of Economy	Probability of State of Economy	Return Deviation from Expected Return	Squared Return Deviation	Product
Roll
Bust	.30	=?	=?	=?
Boom	.70	=?	=?	=?
			2 =	?
Ross
Bust	.30	=?	=?	=?
Boom	.70	=?	=?	=?
			2 =	?

	Standard Deviations
Roll	? %
Ross	? %