SOLUTION: On a particular test, IQ scores for adults follow a bell-shaped distribution with mean= 100 and a variance of 4. In a random sample of 300 adults, approximately how many would have

Question 667084: On a particular test, IQ scores for adults follow a bell-shaped distribution with mean= 100 and a variance of 4. In a random sample of 300 adults, approximately how many would have IQs greater than 104?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
On a particular test, IQ scores for adults follow a bell-shaped distribution with mean= 100 and a variance of 4. In a random sample of 300 adults, approximately how many would have IQs greater than 104?
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z(104)= (104-100)/4 = 1
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P(x > 104) = P(z > 1) = normalcdf(1,100) = 0.1587
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Cheers,
Stan H.
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