The time taken by an auto mechanic to complete an oil change is random with mean...
The time taken by an auto mechanic to complete an oil change is random with mean 30.5 minutes and standard deviation of 2 minutes.
a) What is the probability that 40 oil changes take more than 1250 minutes?
b) What is the probability that a mechanic can complete 60 or more changes in less than 1850 minutes?
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