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?
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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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