document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=624881>Question 624881</A>: <I><SPAN STYLE=\"word-break: break-all;\"> in one city, 21% of adults smoke. in groups of size 130 adults, what is the variance of the number that smoke? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #393199 by </B><A HREF=/tutors/aboutme.mpl?userid=oscargut><B>oscargut(2103)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=oscargut><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=oscargut><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=393199\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Solution:\r<BR>\n" );
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document.write( "we know:  n = 130 and p=0.21\r<BR>\n" );
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document.write( "Variance = np(1-p)= 130(0.21)(0.79) = 21.567\r<BR>\n" );
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document.write( "Answer: 21.567\r<BR>\n" );
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document.write( "If you have any doubt or if you have  more problems my e-mail is:  \r<BR>\n" );
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