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Determining the standard deviation of gas mileages

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Reference no: EM132907512

Suppose you buy a new jetpack whose advertised mileage is 35 miles per gallon (mpg). After flying your jetpack for several months, you find that its mileage is 30.36 mpg. You telephone the manufacturer and learn that the standard deviation of gas mileages for all cars of the model you bought is 1.15 mpg.

(a) Find the z-score for the gas mileage of your jetpack, assuming the advertised claim is correct.

(b) Does it appear that your jetpack is getting unusually low gas mileage? Explain your answer.

Reference no: EM132907512

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