Question: NEED SOLUTION WITHIN 40/50 MINUTES WITH STEP BY STEP APPROACH to get UPVOTE. Exercice 9: Suppose that the life span of the lamp posts in

NEED SOLUTION WITHIN 40/50 MINUTES WITH STEP BY STEP APPROACH to get UPVOTE.

Exercice 9: Suppose that the life span of the lamp posts in Ottawa is normally distributed with an average of 80 months and a variance of 800. If we select 15 street lights at random, what is the probability that only 3 of them will last more than 9 years

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