document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=560128>Question 560128</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If 2% of all calculators are defective, find the mean, variance, and standard deviation of a lot of 400 calculators. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #363681 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=363681\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If 2% of all calculators are defective, find the mean, variance, and standard deviation of a lot of 400 \r<BR>\n" );
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document.write( "mean = np = 400*0.02 = 8<BR>\n" );
document.write( "variance = npq = 8*0.98 = 7.84<BR>\n" );
document.write( "std = sqrt(npq) = sqrt(7.84) = 2.8<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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