document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=472891>Question 472891</A>: <I><SPAN STYLE=\"word-break: break-all;\"> This question has five answer choices. Select the best one of<BR>\n" );
document.write( "the answer choices given.<BR>\n" );
document.write( "16. The figure shows a normal distribution with mean m and<BR>\n" );
document.write( "standard deviation d, including approximate percents of<BR>\n" );
document.write( "the distribution in each of the six regions shown.<BR>\n" );
document.write( "For a population of 800,000 subway riders, the numbers of<BR>\n" );
document.write( "subway trips taken per rider last January are approximately<BR>\n" );
document.write( "normally distributed with a mean of 56 trips and a standard<BR>\n" );
document.write( "deviation of 13 trips. Approximately how many of the riders<BR>\n" );
document.write( "took between 30 and 43 trips last January?<BR>\n" );
document.write( "A 60,000<BR>\n" );
document.write( "B 110,000<BR>\n" );
document.write( "C 160,000<BR>\n" );
document.write( "D 210,000<BR>\n" );
document.write( "E 270,000\r<BR>\n" );
document.write( "\n" );
document.write( "Drawing a picture of the the distribution table will solve this. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #324272 by </B><A HREF=/tutors/aboutme.mpl?userid=edjones><B>edjones(8007)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=edjones><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=edjones><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=324272\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=mu=56 ALIGN=MIDDLE  ALT=\"mu=56\"   DISABLED_style= \"max-width:90%; height:auto;\" >, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sigma=13 ALIGN=MIDDLE  ALT=\"sigma=13\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "z=(30-56)/13=-26/13=-2<BR>\n" );
document.write( "z=(43-56)/13=-13/13=-1<BR>\n" );
document.write( "Area under the normal curve between z=-2 and z=-1 is 0.136<BR>\n" );
document.write( "800,000 * 0.136 = 108,800 B<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Ed </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );