document.write( "Question 550473: Annual Salaries-The frequency distribution illustrates the annual salaries, in thousands of dollars, of the people in management positions at the X-Chek Corporation.\r
\n" ); document.write( "\n" ); document.write( "Salary (in $1000) Number of People
\n" ); document.write( "35–40, 3
\n" ); document.write( "41–46, 6
\n" ); document.write( "47–52, 9
\n" ); document.write( "53–58, 8
\n" ); document.write( "59–64, 7
\n" ); document.write( "65–70, 6
\n" ); document.write( "71–76, 4\r
\n" ); document.write( "\n" ); document.write( "a)Construct a histogram of the frequency distribution.
\n" ); document.write( "b)Construct a frequency polygon of the frequency distribution.\r
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Algebra.Com's Answer #358830 by Edwin McCravy(20060)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "Some textbooks and professors do it slighly different.  I think this\r\n" );
document.write( "isn't much different, if any, from what you are being taught.\r\n" );
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document.write( "To get the numbers to go on the bottom, you subtract .5 from each \r\n" );
document.write( "left bound, 35-.5 = 34.5, 41-.5 = 40.5, etc.  To get the last one,\r\n" );
document.write( "since the difference between each is 6, add 6 to the last one, \r\n" );
document.write( "71.5+6 = 77.5.\r\n" );
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document.write( "The frequency polygon is just a bunch of lines connecting the middle \r\n" );
document.write( "of the tops of the histogram bars, so it's this green zig-zagging\r\n" );
document.write( "line:\r\n" );
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document.write( "But usually you are required to mark off the midpoints of the class\r\n" );
document.write( "intervals under each bar, instead of the midpoints with the .5's.\r\n" );
document.write( "Like the horizontal axis is marked off below:\r\n" );
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document.write( "And maybe you're not supposed to show the histogram\r\n" );
document.write( "but just the green zig-xag line, which is the frequency\r\n" );
document.write( "polygon.\r\n" );
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document.write( "Edwin

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