Iq scores for adults follow a bell-shaped
On the 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?
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We have seen that if Y has the binomial distribution with parameters n and p, then Y/n is an unbiased estimator of p. Te estimate the variance of Y, we generally use n(Y/n)(1-Y/n).
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