finance question,

please help with explanation ! will upvote :)

Question 3 0.33 pts There is a probability of 0.48 that there will be extremely cold weather this coming Winter. If it does, we expect investors of Star & Bucks to achieve a return of 0.19. Else, investors may expect a lower return of 0.05. Can you estimate the standard deviation for investors of Star & Bucks? Type your answer as decimal (i.e. 0.052 and not 5.2%). Round your answer to the nearest four decimals if needed. Question 4 0.33 pts NFLXZ historical returns are 0.03 -0.03 and 0.07. What is the expected return? Type your answer as decimal (i.e. 0.052 and not 5.2%). Round your answer to the nearest four decimals if needed