document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1185778>Question 1185778</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Let us assume that the grades of 500 students are normally distributed with 𝜇=45 and standard deviation 𝜎=20. If the 20% of the students get excellent, what is the grade that determines the excellent? (What is 𝛸 value?) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #816627 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=816627\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> z for the top 20% is +0.8416<BR>\n" );
document.write( "z=(x-mean)/sd<BR>\n" );
document.write( "0.8416=(x-45)/20<BR>\n" );
document.write( "16.8=x-45<BR>\n" );
document.write( "x=61.8 the grade </SPAN>\n" );
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