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Stout Electric Company operates a fleet of trucks that provide electrical services to the construction industry.Monthly mean maintenance cost has been $75 per truck.A random

Stout Electric Company operates a fleet of trucks that provide electrical services to the construction industry.Monthly mean maintenance cost has been $75 per truck.A random sample of 36 trucks shows a mean maintenance cost of $68.25 per month.It is also known that the population standard deviation is $20.Managers want to determine whether or not the mean monthly maintenance cost has decreased.Use a .05 level of significance.

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