document.write( "Question 675479: Scores on a certain exam are normally distributed with a mean of 78 and a variance of 25. What is the z-value for a score of 90? \n" ); document.write( "
Algebra.Com's Answer #419869 by stanbon(75887)\"\" \"About 
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Scores on a certain exam are normally distributed with a mean of 78 and a variance of 25. What is the z-value for a score of 90?
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\n" ); document.write( "z(90) = (90-78)/25 = 2/25 = 0.08
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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