document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=933271>Question 933271</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a college entrance exam has a mean of 1200 and a standard deviation of 100. They will only accept applicants in the 90% percentile or higher. What is the lowest score they would need on the entrance exam? \r<BR>\n" );
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document.write( "Please help! I think I have the answer and want to check my work. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #566721 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=566721\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Using a TI-84, I get\r<BR>\n" );
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document.write( "invNorm(0.90) = 1.28155\r<BR>\n" );
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document.write( "So z = 1.28155, and we'll use this to find the raw score x\r<BR>\n" );
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document.write( "z = (x-mu)/sigma\r<BR>\n" );
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document.write( "1.28155 = (x-1200)/100\r<BR>\n" );
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document.write( "1.28155*100 = x-1200\r<BR>\n" );
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document.write( "128.155 = x-1200\r<BR>\n" );
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document.write( "128.155+1200 = x\r<BR>\n" );
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document.write( "1,328.155 = x\r<BR>\n" );
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document.write( "x = 1,328.155\r<BR>\n" );
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document.write( "Round up to the nearest whole number to ensure you clear the hurdle. So you need to score a 1329 or higher to be in the 90th percentile or higher.\r<BR>\n" );
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document.write( "Jim\r<BR>\n" );
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