document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=204953>Question 204953</A>: <I><SPAN STYLE=\"word-break: break-all;\">  <BR>\n" );
document.write( " The total amount being spent on personal calls in a month by employees of a company follows a normal distribution with a mean of  $900  and a standard deviation of $50 . Find the probability that in a randomly selected month the amount spent on personal calls is less than  $750\r<BR>\n" );
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document.write( "i cant seem to figure this out or even know where to begin!... i would be so,so,so greatful if someone would point me in the right direction and at least give me some tools!please! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #154693 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=154693\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The total amount being spent on personal calls in a month by employees of a company follows a normal distribution with a mean of $900 and a standard deviation of $50 . Find the probability that in a randomly selected month the amount spent on personal calls is less than $750 <BR>\n" );
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document.write( "Draw a normal curve; put u=900 in the middle and sigma = 50 under that.<BR>\n" );
document.write( "Mark the 750 point on the horizontal axis(x-axis).<BR>\n" );
document.write( "Shade the area under the curve to the left of 750.<BR>\n" );
document.write( "That is the area you are looking for.<BR>\n" );
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document.write( "Draw a normal curve and let the horizontal axis be \"z-scores\".<BR>\n" );
document.write( "Put 0 in the middle.<BR>\n" );
document.write( "Find the z-score of  750:<BR>\n" );
document.write( "z(750) = (750-900)/50 = -3<BR>\n" );
document.write( "Mark -3 on the z-axis and shade the area to the left of z = -3.\r<BR>\n" );
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document.write( "Now use a calculator, or software, or a z-chart to find the following:<BR>\n" );
document.write( "P(x<750) = P(z<-3) = normalcdf(-100,-3) = 0.001350<BR>\n" );
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document.write( "I used a TI calculator to find the probability.<BR>\n" );
document.write( "Let me know if this \"explanation\" does not help.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan . </SPAN>\n" );
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