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A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet Cavalier sh?

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 a mechanic is randomly selected, find the probability that the mean rebuild time is less than 7.6 hours.



 

1 Users Response In " A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet Cavalier sh? "

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O'Neil says in September 28th 2010 at 4:12 pm    

z value = (7.6 – 8.4)/1.8 = – 0.44

A reference to normal distribution tables gives

P(rebuild time < 7.6 hours) = 33%

(If greater accuracy than two decimal places is needed, interpolation can be done)


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