document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1103288>Question 1103288</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A preliminary survey shows that 35% of college students smoke. In a class of 42 students, what is the probability that more than half the students smoke? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #718017 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=718017\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  A preliminary survey shows that 35% of college students smoke. In a class of 42 students, what is the probability that more than half the students smoke? <BR>\n" );
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document.write( "Binomial problem with n = 42 and p = 0.35<BR>\n" );
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document.write( "mean = 0.35*42 = 14.7<BR>\n" );
document.write( "std = sqrt(npq) = sqrt(14.7*0.65) = 3.0911<BR>\n" );
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document.write( "z(21) = (21-14.7)/3.0911 = 2.0381<BR>\n" );
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document.write( "P(x > 21) = P(z > 2.0381) = normalcdf(2.0381,100) = 0.0277<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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document.write( " </SPAN>\n" );
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