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The time (in hours) that a technician requires to perform preventative maintenance on air conditioning is governed by the exponential curve. In this case, the

The time (in hours) that a technician requires to perform preventative maintenance on air conditioning is governed by the exponential curve. In this case, the mean time is 1 hour and the standard deviation is 1 hour. Imagine that the company has a contract to maintain 70 of these units in an apartment building.

a) What is the probability that the average maintenance time exceeds 1.1 hours?

b) What is the probability that the average maintenance time exceeds 1.25 hours?

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