Crossett Truck Rental has a large fleet of rental trucks. At times many of the trucks need substantial repairs. Mr. Crossett has requested a study of the repair costs. A random sample of 64 trucks is selected. The mean annual repair cost for the sample is $1,200. Estimate the mean annual repair cost for all rental trucks using a 95 percent confidence interval for the population mean. Assume that the population standard deviation, σ, is equal to $280.

• Estimate the mean annual repair cost for all rental trucks using a 95 percent confidence interval for the population mean.
• Complete the bell-curve diagram including all points
• Interpret the results

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