<PRE><B>Question 659634</B>
The distribution of SAT scores is normal with a mean of 500 and SD of 100. 
What SAT score, X value, separates the top 15% of the distribution from the rest?
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Find the z-value with a left-tail of 85%: 
Using my TI-84 I get z = invNorm(0.85) = 1.0364
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Find the corresponding SAT score using x = z*s + u
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Score = 1.0364*100 + 500 = 603.64
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Cheers,
Stan H.</PRE>