document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=999892>Question 999892</A>: <I><SPAN STYLE=\"word-break: break-all;\"> According to data collected, 0.6% of Facebook users are under 13(the site is restricted to users 13 and older). In a simple random sample of 500 children under the age of 13, find the mean and standard deviation for number of Facebook users. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #617445 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=617445\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> np is the mean, and it is 500*.006=3<BR>\n" );
document.write( "standard deviation is square root of variance, which is np(1-p)<BR>\n" );
document.write( "(1-p)=0.004<BR>\n" );
document.write( "np(1-p)=2.982<BR>\n" );
document.write( "square root of that is 1.73 to two decimal places. </SPAN>\n" );
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