(Solution Library) A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet Cavalier shows that the mean is 8.4 hours
Question: A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet Cavalier shows that the mean is 8.4 hours and the standard deviation is 1.8 hours. If 40 mechanics are randomly selected, find the probability that their mean rebuild time exceeds 7.7 hours.
Deliverable: Word Document 
![[Solution] Find the standard deviation for the](/images/solutions/MC-solution-library-45802.jpg "[Solution] Find the standard deviation for the given probability")
[Solution] Find the standard deviation for the given probability
![[See Solution] Find the Critical value z_alpha](/images/solutions/MC-solution-library-45803.jpg "[See Solution] Find the Critical value z_alpha /2 that corresponds")
[See Solution] Find the Critical value z_alpha /2 that corresponds
![[Solution Library] Use the confidence level and](/images/solutions/MC-solution-library-45804.jpg "[Solution Library] Use the confidence level and sample data to find the")
[Solution Library] Use the confidence level and sample data to find the
(All Steps) Use the confidence level and sample data to find a confidence
(Solution Library) Use the confidence level and sample data to
Confidence Interval for Proportion Calculator - MathCracker.com