document.write( "Question 970103: I need help with this question. The scores for math test #3 were normally distributed. If 15 students had a mean score of 74.8% and a standard deviation of 7.57, how many students scored above an 85%?
\n" ); document.write( " \n" ); document.write( "

Algebra.Com's Answer #592874 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
Find the z score.
\n" ); document.write( " $\"z=%2885-74.8%29%2F7.57=1.347\"$
\n" ); document.write( "Find the probability associated with that z score.
\n" ); document.write( " $\"P=0.9111\"$
\n" ); document.write( "So scores above 85% would have a probability of $\"1-0.9111=0.0889\"$
\n" ); document.write( "Out of the 15 students,
\n" ); document.write( " $\"15%280.0889%29=1.33=1\"$ student would have that score.
\n" ); document.write( "One student \n" ); document.write( "

\n" );