document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1143537>Question 1143537</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose that at a large university 30% of students are involved in intramural sports. If we randomly select 20  students from this university, what is the probability that more than 7 of these students are involved in intramural sports?<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 #764417 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=764417\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Use normal approximation<BR>\n" );
document.write( "mean is np=.30*20=6<BR>\n" );
document.write( "variance is np(1-p)=6*0.70=4.2<BR>\n" );
document.write( "sd is sqrt (V)=2.05<BR>\n" );
document.write( "greater than 7 using continuity correction factor of 7.5<BR>\n" );
document.write( "z>(7.5-6)/2.05 or z> 0.73<BR>\n" );
document.write( "0.2327 is probability \r<BR>\n" );
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document.write( "calculator gives 0.2277 for exact answer. </SPAN>\n" );
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