Question: Please help & explain how to get the answers:) Part 1: There is a probability of 0.34 that there will be extremely cold weather this

Please help & explain how to get the answers:)
Part 1:
There is a probability of 0.34 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 0.03. Can you estimate the variance of this rate of return?
Part 2:
There is a probability of 0.36 that there will be extremely cold weather this coming winter. If it does, we expect investors of Star & Bucks to achieve a return of 0.16. Else, investors may expect a lower return of 0.07 can you estimate the standard deviation for investors of Star & Bucks?

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