SOLUTION: In a standardized IQ test, scores are normally distributed, with a mean of 100 and a standard deviation of 15. Out of 2000 randomly selected people, about how many would you expec

SOLUTION: In a standardized IQ test, scores are normally distributed, with a mean of 100 and a standard deviation of 15. Out of 2000 randomly selected people, about how many would you expec

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Question 1155395: In a standardized IQ test, scores are normally distributed, with a mean of 100 and a standard deviation of 15. Out of 2000 randomly selected people, about how many would you expect to have an IQ score of less than 90?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
z=(x-mean)/sd or (90-100)/15=-2/3
probability of z< -2/3 is 0.2525 for each
2000*.2525=505 ANSWER
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