document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=367187>Question 367187</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I keep getting told my answer is incorrect for this problem, please help!<BR>\n" );
document.write( "20% of people own 3 or more cars. 100 households are selected. X= the number of households with 3 or more cars. The variance of X is?<BR>\n" );
document.write( "I submitted 20 and then re-did the problem and came up with 4.<BR>\n" );
document.write( "Now I am told that 4 is also incorrect.<BR>\n" );
document.write( "Please help! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #261779 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=261779\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 20% of people own 3 or more cars. 100 households are selected. X= the number of households with 3 or more cars. The variance of X is?<BR>\n" );
document.write( "----------<BR>\n" );
document.write( "Binomial with n = 100 and p = 0.2<BR>\n" );
document.write( "u = np = 2<BR>\n" );
document.write( "std = sqrt(npq) = sqrt(2*0.8) = 0.4\r<BR>\n" );
document.write( "\n" );
document.write( "---<BR>\n" );
document.write( "Variance of X = 0.4^2 = 1.6<BR>\n" );
document.write( "=====================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.  \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );