SOLUTION: if it rains, an umbrella salesman can earn 20$ per day .if it's fair day he loses 5$ per day .What is his expectations if the probability of rain is 0.3?

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Question 1147713: if it rains, an umbrella salesman can earn 20$ per day .if it's fair day he loses 5$ per day .What is his expectations if the probability of rain is 0.3?
Answer by ikleyn(52803) About Me  (Show Source):
You can put this solution on YOUR website!
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His expectation is  20*0.3 + (-5)*(1-0.3) = 20*0.3 - 5*0.7 = 2.5 dollars.