SOLUTION: The Census Bureau reports that 82% of Americans over the age of 25 are high school graduates. A survey of randomly selected residents of certain county included 1260 who were over

Question 506351: The Census Bureau reports that 82% of Americans over the age of 25 are high school graduates. A survey of randomly selected residents of certain county included 1260 who were over the age of 25, and 1035 of them were high school graduates.
(a) Find the mean and standard deviation for the number of high school graduates in groups of 1260 Americans over the age of 25.
Mean =
Standard deviation =
Is that county result of 1035 unusually high, or low, or neither?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The Census Bureau reports that 82% of Americans over the age of 25 are high school graduates.
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A survey of randomly selected residents of certain county included 1260 who were over the age of 25, and 1035 of them were high school graduates.
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(a) Find the mean and standard deviation for the number of high school graduates in groups of 1260 Americans over the age of 25.
Mean = np = 1260*0.82 = 1033.2
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Standard deviation = sqrt[npq] = sqrt(1260*0.82*0.18) = 13.64
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Is that county result of 1035 unusually high, or low, or neither?
Neither
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Cheers,
Stan H.
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