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On a particular test, IQ scores for adults follow a bell-shaped (sym.pdf

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On a particular test, IQ scores for adults follow a bell-shaped (symmetric) distribution with mean=100 and a variance of 100. In a random sample of 1250 adults, approximately how many would have IQs between 90 and 120? Solution ans = 1250*30/200 = 187 approx..

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On a particular test, IQ scores for adults follow a bell-shaped (symmetric) distribution with mean=100 and a variance of 100. In a random sample of 1250 adults, approximately how many would have IQs between 90 and 120? Solution ans = 1250*30/200 = 187 approx.

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  • 1. On a particular test, IQ scores for adults follow a bell-shaped (symmetric) distribution with mean=100 and a variance of 100. In a random sample of 1250 adults, approximately how many would have IQs between 90 and 120? Solution ans = 1250*30/200 = 187 approx.