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    Probability and z-score

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    New car manufacturer claims that miles per gallon for gas consumption is mound shaped and symmetric with a mean of 25.9 mpg with a standard deviation of 9.5 mpg. If 30 cars are tested, what is the probability the average mpg achieved by these 30 cars will be greater than 28?

    Answer rounded to the nearest 4 decimal places.

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    https://brainmass.com/statistics/probability/probability-z-score-221293

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