SOLUTION: Assume that adults have IQ scores that are normally distributed with a mean of 105 and standard deviation 15. Find P9 which is the IQ score separating the bottom 9% from the top 91
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Question 795605: Assume that adults have IQ scores that are normally distributed with a mean of 105 and standard deviation 15. Find P9 which is the IQ score separating the bottom 9% from the top 91%.
Any help would be greatly appriciated
Thanks, Cass Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! Assume that adults have IQ scores that are normally distributed with a mean of 105 and standard deviation 15. Find P9 which is the IQ score separating the bottom 9% from the top 91%.
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Find the z-value with a left tail of 9%.
invNorm(0.09) = -1.3408
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Find the corresponding "x" value::
x = z*s +u
x = -1.3408*15+105 = 84.89
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Cheers,
Stan H.
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