document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=476564>Question 476564</A>: <I><SPAN STYLE=\"word-break: break-all;\"> classes     frequency     <BR>\n" );
document.write( "0-10         4              <BR>\n" );
document.write( "10-20        8            <BR>\n" );
document.write( "20-30        7<BR>\n" );
document.write( "30-40       10\r<BR>\n" );
document.write( "\n" );
document.write( "In this how to draw a frequency polygon?<BR>\n" );
document.write( "since as we know that the class previous of the first will -10-0.....please help me to draw this frequency polygon? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #326781 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=326781\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "you create the frequency polygon by finding the midpoint of each class and then<BR>\n" );
document.write( "drawing a graph from it.<BR>\n" );
document.write( "the graph would be a straight line between the midpoints on the graph.<BR>\n" );
document.write( "first you have to find the midpoints.<BR>\n" );
document.write( "midpoint of 0-10 = 5<BR>\n" );
document.write( "midpoint of 10-20 = 15<BR>\n" );
document.write( "midpoint of 20-30 = 25<BR>\n" );
document.write( "midpoint of 30-40 = 35<BR>\n" );
document.write( "those are the x-value of your graph.<BR>\n" );
document.write( "the y-values of your graph are the frequencies in each class.<BR>\n" );
document.write( "so you now have (x,y) coordinate pairs on your graph.<BR>\n" );
document.write( "they are:<BR>\n" );
document.write( "<PRE STYLE=\"white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;\">\r\n" );
document.write( "x       y\r\n" );
document.write( "5       4\r\n" );
document.write( "15      8\r\n" );
document.write( "25      7\r\n" );
document.write( "35      10\r\n" );
document.write( "</PRE><BR>\n" );
document.write( "the following reference will show you how to draw the graph.<BR>\n" );
document.write( "<a  rel=nofollow HREF= \"http://www.math-mate.com/chapter16_10.shtml\" target = \"_blank\">http://www.math-mate.com/chapter16_10.shtml</a> </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );