document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1125105>Question 1125105</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me Thank you in advance<BR>\n" );
document.write( "A major credit card company has determined that the amount its customers charge on their accounts is normally distributed with an average of R2800 per month and a standard deviation of R200.\r<BR>\n" );
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document.write( "2.1)	What proportion of customers charge more than R2750 per month on their account (rounded off to three decimals)?												[3]<BR>\n" );
document.write( "2.2)	What percentage of customers charge between R2410 and R3016 per month on their account (rounded off to two decimals)?												[5]<BR>\n" );
document.write( "2.3)	If the company has 20, 000 customers, how many customers charge less than R2430 per month on their account (rounded off to zero decimals)?									[2]<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #741500 by </B><A HREF=/tutors/aboutme.mpl?userid=Theo><B>Theo(13342)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Theo><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=Theo><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=741500\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A major credit card company has determined that the amount its customers charge on their accounts is normally distributed with an average of R2800 per month and a standard deviation of R200.\r<BR>\n" );
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document.write( "the mean is 2800 and the standard deviation is 200.\r<BR>\n" );
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document.write( "2.1)	What proportion of customers charge more than R2750 per month on their account (rounded off to three decimals)? [3]\r<BR>\n" );
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document.write( "the proportion of customers that charge more than 2750 per month is .599.\r<BR>\n" );
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document.write( "2.2)	What percentage of customers charge between R2410 and R3016 per month on their account (rounded off to two decimals)?	[5]\r<BR>\n" );
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document.write( "the proportion of customers that charge between 2410 and 3016 per month is .83.\r<BR>\n" );
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document.write( "2.3)	If the company has 20,000 customers, how many customers charge less than R2430 per month on their account (rounded off to zero decimals)?	[2]\r<BR>\n" );
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document.write( "the proportion of customer who charge less than 2430 is .0322.\r<BR>\n" );
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document.write( "with 20,000 customers that comes out to be .0322 * 20,000 = 644.\r<BR>\n" );
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document.write( "the calculator i used can be found at <a  rel=nofollow HREF= \"http://davidmlane.com/hyperstat/z_table.html\" target = \"_blank\">http://davidmlane.com/hyperstat/z_table.html</a>\r<BR>\n" );
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document.write( "this is a very nice calculator that takes the drudgery out of finding your answer.\r<BR>\n" );
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document.write( "if you need to know how to do it manually, i have some tutorials that might help.\r<BR>\n" );
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document.write( "there are other ways to find the answer using technology.\r<BR>\n" );
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document.write( "i use the TI-84 Plus Scientific calculator that works good but does require a bit more knowledge on how to use it.\r<BR>\n" );
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document.write( "there are also online calculators that work similar to how you would use the z-score tables.\r<BR>\n" );
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document.write( "these also require a bit more knowledge but require less more work than using the z-score tables and are a bit more accurate.\r<BR>\n" );
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document.write( "i confirmed with the TI-84 Plus that the answer is correct.\r<BR>\n" );
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document.write( "if you need lessons on z-scores and how to use them, the following tutorials might be helpful.\r<BR>\n" );
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document.write( "<a  rel=nofollow HREF= \"https://www.algebra.com/algebra/homework/Probability-and-statistics/change-this-name28108.lesson\" target = \"_blank\">https://www.algebra.com/algebra/homework/Probability-and-statistics/change-this-name28108.lesson</a>\r<BR>\n" );
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document.write( "<a  rel=nofollow HREF= \"https://www.algebra.com/algebra/homework/Probability-and-statistics/THEO-20091109.lesson?content_action=show_source\" target = \"_blank\">https://www.algebra.com/algebra/homework/Probability-and-statistics/THEO-20091109.lesson?content_action=show_source</a>\r<BR>\n" );
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document.write( "here's my displays of the use of the online calculator to solve your problem.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" src = \"http://theo.x10hosting.com/2018/100303.jpg\" alt=\"$$$\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" src = \"http://theo.x10hosting.com/2018/100304.jpg\" alt=\"$$$\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" src = \"http://theo.x10hosting.com/2018/100305.jpg\" alt=\"$$$\" >\r<BR>\n" );
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