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.
Salary (in $1000) Number of People
35–40, 3
41–46, 6
47–52, 9
53–58, 8
59–64, 7
65–70, 6
71–76, 4
a)Construct a histogram of the frequency distribution.
b)Construct a frequency polygon of the frequency distribution.
Thank you in advance for all of your help.
Answer by Edwin McCravy(20060)   (Show Source):
You can put this solution on YOUR website!
Some textbooks and professors do it slighly different. I think this
isn't much different, if any, from what you are being taught.
To get the numbers to go on the bottom, you subtract .5 from each
left bound, 35-.5 = 34.5, 41-.5 = 40.5, etc. To get the last one,
since the difference between each is 6, add 6 to the last one,
71.5+6 = 77.5.
The frequency polygon is just a bunch of lines connecting the middle
of the tops of the histogram bars, so it's this green zig-zagging
line:
But usually you are required to mark off the midpoints of the class
intervals under each bar, instead of the midpoints with the .5's.
Like the horizontal axis is marked off below:
And maybe you're not supposed to show the histogram
but just the green zig-xag line, which is the frequency
polygon.
Edwin
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