document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1121569>Question 1121569</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The probability that an individual is left-handed is 0.13. In a class of 20 students, use the binomial distribution to determine what is the mean and standard deviation of the number of left-handers in the class? \r<BR>\n" );
document.write( "\n" );
document.write( "a. mean: 2.6; standard deviation: 1.61<BR>\n" );
document.write( "b. mean: 2.6; standard deviation: 1.50<BR>\n" );
document.write( "c. mean: 20; standard deviation: 1.50<BR>\n" );
document.write( "d. mean: 20; standard deviation: 1.61\r<BR>\n" );
document.write( "\n" );
document.write( "have a look please </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #737499 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=737499\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> mean is np or 20*0.13 or 2.6<BR>\n" );
document.write( "sd is sqrt (variance), and V=np(1-p) or 2.6*0.87=2.262<BR>\n" );
document.write( "sqrt(2.262)=1.50<BR>\n" );
document.write( "c </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );