document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=948849>Question 948849</A>: <I><SPAN STYLE=\"word-break: break-all;\"> amount being spent on personal phone calls followed a normal distribution with an average of $500/month and a standard eviation of $50/month. What is the probablity that a randomly selected month had a call expense between $375 and $590?\r<BR>\n" );
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document.write( "I have come up with an answer of 0.9999 and 0.9579.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #579154 by </B><A HREF=/tutors/aboutme.mpl?userid=Fombitz><B>Fombitz(32388)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Fombitz><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=Fombitz><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=579154\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> How do you have two answers?<BR>\n" );
document.write( "You should only have 1.<BR>\n" );
document.write( "Find the z score for both points.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=z=%28x-mu%29%2Fsigma ALIGN=MIDDLE  ALT=\"z=%28x-mu%29%2Fsigma\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=z%5B1%5D=%28375-500%29%2F50=-2.5 ALIGN=MIDDLE  ALT=\"z%5B1%5D=%28375-500%29%2F50=-2.5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=z%5B2%5D=%28590-500%29%2F50=1.8 ALIGN=MIDDLE  ALT=\"z%5B2%5D=%28590-500%29%2F50=1.8\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "So then,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=P=P%28z%5B2%5D%29-P%28z%5B1%5D%29 ALIGN=MIDDLE  ALT=\"P=P%28z%5B2%5D%29-P%28z%5B1%5D%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=P=0.96407-0.00621 ALIGN=MIDDLE  ALT=\"P=0.96407-0.00621\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=P=0.95786 ALIGN=MIDDLE  ALT=\"P=0.95786\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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