A random sample of 40 cars in the drive−thru of a popular fast food restaurant revealed...

A random sample of 40 cars in the drive−thru of a popular fast food restaurant revealed an average bill of $16.10 per car. The population standard deviation is $4.79. Estimate the mean bill for all cars from the drive−thru with 91% confidence. Use a graphing calculator and round the answers to two decimal places.

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The solution is done showing all steps with calculations and required explanations. For better understanding a z table is also attached. Hope you can understand.

z-table -

orchestra answered 2 years ago

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