The repair time for air conditioning units is believed to have a normal distribution with a mean of 38 minutes. a. What is the standard deviation of repair time if 40% of the units are repaired between 33 and 43 minutes? b. Using the value of the standard deviation that you calculated in a., what is the probability that a repair will be longer than an hour? c. Using the value of the standard deviation that you calculated in a., what is the probability that the repair time for an air conditioning unit will be less than 25 minutes?

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