What is the expected standard deviation of stock As returns based on the information presented in the table? Answer as a rate in decimal format so that 12.34% would be entered as .1234 and 0.98% would be entered as .0098. Note that figures in the table are presented in decimal format, not as percentages.

Outcome	Probability of outcome	Stock A return in outcome
Good	0.2	0.7
Medium	0.5	0.1
Bad	?	-0.2