document.write( "Question 383648: Suppose that IQ scores are normally distributed with mean = 100 and Standard Dev. = 10. Find the 90th percentile of IQ scores. (nearest whole number)
\n" ); document.write( "What is the x, y, p and q of this problem. The answer is 113, but how.. \n" ); document.write( "

Algebra.Com's Answer #271664 by Fombitz(32388) $\"\"$ $\"About$

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Find the z-score so that $\"P%28z%29=0.90\"$ .
\n" ); document.write( "Using EXCEL's NORMSINV for $\"P%28z%29=0.90\"$ , $\"z=1.281552\"$ .
\n" ); document.write( " $\"z=%28x-mu%29%2Fsigma\"$
\n" ); document.write( " $\"%28x-100%29%2F10=1.28152\"$
\n" ); document.write( " $\"x-100=12.8152\"$
\n" ); document.write( " $\"x=112.8152\"$
\n" ); document.write( "Rounding up, $\"highlight%28x=113%29\"$ \r
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