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Service call can be represented by a normal

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1. A review of the service call records of Ed's Electric indicates that the time taken for a service call can be represented by a normal distribution with mean 45 minutes and standard deviation 10 minutes.

a. What is the probability that a service call takes more than 30 minutes? (Be sure to indicate the relevant Z-score for the problem).

b. What is the probability that a service call takes less than an hour? (Be sure to indicate the relevant Z-score for the problem).

c. An electrician is scheduled to make 3 calls in a morning. The times taken for each call are independent of one another. What is the probability that all 3 of the calls will take more than one hour?

Reference no: EM132093864

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