SOLUTION: A final exam in statistic has a mean of 73 with a standard deviation of 7.73. Random sample of 24 students is selected and the mean test score of the sample is computed. What perc
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Question 609948: A final exam in statistic has a mean of 73 with a standard deviation of 7.73. Random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! A final exam in statistic has a mean of 73 with a standard deviation of 7.73. Random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?
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z(70) = (70-73)/[7.73/sqrt(24)] = 1.9013
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P(x-bar < 70) = P(z < 1.9013) = 0.9714
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Cheers,
Stan H.
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