A review of the service call records of Paul’s Plumbing indicates that the time taken for...
A review of the service call records of Paul’s Plumbing indicates that the time taken for a service call can be represented by a normal distribution with mean 75 minutes and standard deviation 20 minutes.
a. What is the probability that a service call takes more than 60 minutes? (Be sure to indicate the relevant Z-score for the problem).
b. What is the probability that a service call takes less than 80 minutes? (Be sure to indicate the relevant Z-score for the problem).
c. A plumber 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 and 20 minutes each?
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A review of the service call records of Paul’s Plumbing
indicates that the time taken for...
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