Anastasia V.
asked • 10/25/20What is the IQ score separating the bottom 20% from the top 80%?
Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15. Let X be the IQ scores for adults.
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1 Expert Answer
Patrick B. answered • 10/25/20
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4.7
(31)
Math and computer tutor/teacher
The z-score,z, such that Prob( Z < z) = 0.2 is z=-0.841621234
X = z*stndDev + mean
= -0.841621234 * 15 + 100
= 87.3756815
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Anastasia V.
Use the normal curve to explain your answer.10/25/20