document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=926324>Question 926324</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Igor’s statistics professor gives final grades that are normally distributed with a mean of 68 and a standard deviation of 10.  The professor says that the top 5% of the class will receive an A and the next 20% of the class will receive a B.\r<BR>\n" );
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document.write( " What is the minimum grade needed for an A?\r<BR>\n" );
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document.write( "      What is the minimum grade needed for a B?<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #562163 by </B><A HREF=/tutors/aboutme.mpl?userid=ewatrrr><B>ewatrrr(24785)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ewatrrr><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=ewatrrr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=562163\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  mean of 68 and a standard deviation of 10<BR>\n" );
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document.write( "the minimum grade needed for an A: 85<BR>\n" );
document.write( "10(invNorm(.95)) + 68 = 10(invNorm(1.6449)) + 68 = 84.449<BR>\n" );
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document.write( "What is the minimum grade needed for a B: 74<BR>\n" );
document.write( "10(invNorm(.70)) + 68 = 10(invNorm(.5244)) + 68 = 73.244<BR>\n" );
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