document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=869231>Question 869231</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The amount of time that office workers at Company XYZ spend on the computer each workday 	is normally distributed with a mean of 3.1 hours and a standard deviation of 0.5 hours. Find the 	percentage of office workers at Company XYZ who spend less than 4.1 hours on the computer 	per workday.\r<BR>\n" );
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document.write( "		(a)	97.72%		(b)	65.00%		(c)	95.00%		(d)	99.70%\r<BR>\n" );
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document.write( "I have:  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x-mean%29%2F%28standard+deviation%2Fsquare+root+of+n%29 ALIGN=MIDDLE  ALT=\"%28x-mean%29%2F%28standard+deviation%2Fsquare+root+of+n%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "            4.1 - 3.1= 1/.5 = 2. Looked up in the back of chart E (Standard deviation) and got .9772   turned into percent would be 97.72%, correct? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #524079 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=524079\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> z = (x-mu)/sigma<BR>\n" );
document.write( "z = (4.1-3.1)/0.5<BR>\n" );
document.write( "z = 1/0.5<BR>\n" );
document.write( "z = 2\r<BR>\n" );
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document.write( "Now use a <a  rel=nofollow HREF=\"http://www.math.upenn.edu/~chhays/zscoretable.pdf\">table</a> to find the area to the left of z = 2. This is approximately 0.9772 (roughly 97.72%)\r<BR>\n" );
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document.write( "So you are correct. The only typo you made was writing <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x-mean%29%2F%28standard+deviation%2Fsquare+root+of+n%29 ALIGN=MIDDLE  ALT=\"%28x-mean%29%2F%28standard+deviation%2Fsquare+root+of+n%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > when you should have written <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x-mu%29%2Fsigma ALIGN=MIDDLE  ALT=\"%28x-mu%29%2Fsigma\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=mu+=+mean ALIGN=MIDDLE  ALT=\"mu+=+mean\"   DISABLED_style= \"max-width:90%; height:auto;\" > (greek letter lowercase mu)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sigma+=+standard_deviation ALIGN=MIDDLE  ALT=\"sigma+=+standard_deviation\"   DISABLED_style= \"max-width:90%; height:auto;\" > (greek letter lowercase sigma)<BR>\n" );
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