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Hi thanks a lot for the reply. Missed the whole reverse engineering to get market SD.
So from above marketSD = (.5*.016)/.6, so marketSD = 1.3%?? I can work out the beta for stock Y from this now.
However Im still a little unsure about part 1. Im taking it that expected return is weighting*variance??
So for stock X that would be .5*(.016)². However for stock Y we are not given its SD to work out the variance?