document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1084229>Question 1084229</A>: <I><SPAN STYLE=\"word-break: break-all;\">  Scores on a test are approximately normally distributed with a mean of 70 and a standard deviation of 9. The teacher wants to give A&#697;s to the top 10% of students, B&#697;s to the next 25%, and C&#697;s to the next 42%. What is the bottom cutoff for a C grade? Round your answer to the nearest whole number.\r<BR>\n" );
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document.write( "A) 77<BR>\n" );
document.write( "B) 65<BR>\n" );
document.write( "C) 63<BR>\n" );
document.write( "D) 68 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #698316 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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/cgi-bin/show-face.mpl?user=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=698316\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Bottom cutoff for C is after top 77% or 23rd percentile.<BR>\n" );
document.write( "That is at z=-0.74<BR>\n" );
document.write( "-0.74=(x-mean)/sd<BR>\n" );
document.write( "9*-0.74=x-70<BR>\n" );
document.write( "63.34=x<BR>\n" );
document.write( "C. </SPAN>\n" );
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