# SOLUTION: IQ scores are normally distributed with a mean u=100 and a standard deviation o=15. Based on this distribution, determine A. the percentage IQ scores between 100 and 120. B. t

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 Question 84799This question is from textbook Elementary Statistics in social research : IQ scores are normally distributed with a mean u=100 and a standard deviation o=15. Based on this distribution, determine A. the percentage IQ scores between 100 and 120. B. the probability of selecting a person at random having an IQ between 100 and 120 C. the percentage of IQ scores between 88 and 100. D. the probability of selecting a person at random having and IQ between 88 and 100. E. the percentage of IQ scores that 110 or above. F. the probability of selecting a person at random having an IQ of 110 or above.This question is from textbook Elementary Statistics in social research Answer by stanbon(57203)   (Show Source): You can put this solution on YOUR website!IQ scores are normally distributed with a mean u=100 and a standard deviation o=15. Based on this distribution, determine A. the percentage IQ scores between 100 and 120. The z-score of 100 is zero; The z-score of 120 is (120-100)/15 = 1.3333 P(0 ------------------ B. the probability of selecting a person at random having an IQ between 100 and 120 Prob = 0.4088 --------------------- C. the percentage of IQ scores between 88 and 100. z-score of 88 = (88-100)/15 = -0.8 z-score of 100 = 0 P(-0.8 ---------------- D. the probability of selecting a person at random having and IQ between 88 and 100. Same answer as C. ----------------------- E. the percentage of IQ scores that 110 or above. z-score of 110 is (110-100)/15 = 0.666667 P(z>0.6666667) = 0.2525 = 25.25% ---------------- F. the probability of selecting a person at random having an IQ of 110 or above. Same as E. ================== Cheers, Stan H.