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The manufacturer of the Ososki motorcycle advertises that the cycle will average 87 miles per gallon of gasoline. A sample of eight bikes revealed the following mileage:

88, 82, 81, 87, 80, 78, 79, 89

At the .05 level, is the mean mileage less than the advertised 87 miles per gallon?

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To test if the mean mileage less than the advertised 87 miles per gallon.

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The manufacturer of the Ososki motorcycle advertises that the cycle will average 87 miles per gallon of gasoline. A sample of eight bikes revealed the following mileage:

88, 82, 81, 87, 80, 78, 79, ...

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