SOLUTION: A university has 10,000 students of which 6000 are male and 4000 are female. If a class of 30 students is chosen at random from the university population, find the mean and varian

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Question 417639: A university has 10,000 students of which 6000 are male and 4000 are female. If a class of 30 students is chosen at random from the university population, find the mean and variance of the number of male students.
Answer by stanbon(75887) About Me  (Show Source):
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A university has 10,000 students of which 6000 are male and 4000 are female. If a class of 30 students is chosen at random from the university population, find the mean and variance of the number of male students.
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Proportion of males = 0.6
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Mean of males = np = 0.6*6000 = 3600
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variance of males = sqrt[npq] = sqrt[3600*0.4] = sqrt(1440) = 37.95
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Cheers,
Stan H.
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