Sarah scores an 85 on an (IQ) test with a mean of 94 and a
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Sarah scores an 85 on an (IQ) test with a mean of 94 and astandard deviation of 10. At what percentile rank is she withrespect to the rest of the population?
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4.4 Ratings (586 Votes)
µ = 94
? = 10
left tailed
P( X ? 85.000 )
Z =(X - µ ) / ? = ( 85 -
94 ) / 10
Z = -0.900
P(X ? 85 ) = P(Z ?
-0.90 ) = 0.1841
excel formula for probability from z score is
=NORMSDIST(Z)
her percentile is 18.41 th
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