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Assume that adults have IQ scores that are normally distributed with a mean of mu equals...

Assume that adults have IQ scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. Find the probability that a randomly selected adult has an IQ between 85 and 115. The probability that a randomly selected adult has an IQ between 85 and 115 is:

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Answer #1

Let "X" be the IQ scores of adults.

Refer Standard normal table/Z-table to find the probability or use excel formula "=NORM.S.DIST(0.75, TRUE)" & "=NORM.S.DIST(-0.75, TRUE)" to find the probability.

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