document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1192242>Question 1192242</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The number of motorcycles sold annually by salespeople is normally distributed with a standard deviation of 15. A random sample of 300 salespeople taken and the mean number of motorcycles sold annually was found to be 75. Find the 99% confidence interval estimate of the population mean. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #824152 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=824152\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 99% half-interval is z*sqrt(p*(1-p)/n)<BR>\n" );
document.write( "=2.576*sqrt(.25*.75/300)<BR>\n" );
document.write( "=0.0644<BR>\n" );
document.write( "the interval is mean+/- half-interval<BR>\n" );
document.write( "(0.1856, 0.3144) </SPAN>\n" );
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