[Solution Library] The repair time for AC units is believed to have a normal distribution with a mean of 40 minutes. What is the standard deviation of repair
Question: The repair time for AC units is believed to have a normal distribution with a mean of 40 minutes. What is the standard deviation of repair time if 40% of the units are repaired between 37 and 43 minutes?
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![[See Steps] A piece of electronic equipment](/images/solutions/MC-solution-library-74409.jpg "[See Steps] A piece of electronic equipment contains nine computer")
[See Steps] A piece of electronic equipment contains nine computer
(Solution Library) A piece of electronic equipment contains nine computer
![[Steps Shown] A piece of electronic equipment](/images/solutions/MC-solution-library-74411.jpg "[Steps Shown] A piece of electronic equipment contains nine computer")
[Steps Shown] A piece of electronic equipment contains nine computer
![[Solution] Johnny wants to construct a 95%](/images/solutions/MC-solution-library-74412.jpg "[Solution] Johnny wants to construct a 95% confidence interval.")
[Solution] Johnny wants to construct a 95% confidence interval.
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[Solution Library] In Keno there are 80 numbers to choose from
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