document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=627092>Question 627092</A>: <I><SPAN STYLE=\"word-break: break-all;\"> if 1% of all calculators are defective, find the mean, variance and standard deviation of a lot of 500 calculators.   \r<BR>\n" );
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document.write( "this site NEVER helps me. i found a similar problem already posted but the answer solution makes NO SENSE to me since they do not show or explain any of the steps. i think this site should be taken down unless people give detailed answers because seeing a bunch of fdjsigadfh equations is not helping me at all for statistics... with that said, any help is appreciated. heh </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #394668 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=394668\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Mean:\r<BR>\n" );
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document.write( "mu = np\r<BR>\n" );
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document.write( "mu = 500*0.01\r<BR>\n" );
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document.write( "mu = 5\r<BR>\n" );
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document.write( "So the mean is 5\r<BR>\n" );
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document.write( "Variance:\r<BR>\n" );
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document.write( "sigma^2 = np*(1-p)\r<BR>\n" );
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document.write( "sigma^2 = 500*0.01*(1-0.01)\r<BR>\n" );
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document.write( "sigma^2 = 4.95\r<BR>\n" );
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document.write( "So the variance is 4.95\r<BR>\n" );
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document.write( "Standard Deviation:\r<BR>\n" );
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document.write( "sigma = sqrt(np*(1-p))\r<BR>\n" );
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document.write( "sigma = sqrt(500*0.01*(1-0.01))\r<BR>\n" );
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document.write( "sigma = 2.2248595\r<BR>\n" );
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document.write( "So the variance is roughly 2.2248595\r<BR>\n" );
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document.write( "Note: the standard deviation is the square root of the variance. </SPAN>\n" );
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