Question

Alice and Bob are taking turns to shoot at a target. Assume that they are each equally like to take the first shot. Alice has a hit rate 3/4 and Bob has a hit rate of 4/5. Then, what is the expected value of the number of hits (Alice and Bob combined) after a total of 5 shots

Answer 1

7

Explanation:

15/20 times 5 is 75/20, simplified that is 3 15/20

16/20 times 5 is 80/20, simplified that is 4