A
relative frequency histogram compares each class interval to the total number of items. For example, the first interval ($1–$5) contains 8 out of the total of 32 items, so the relative frequency of the first class interval is 8/32. See Table
1 .
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TABLE 1
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Distribution of Items Sold at Garage Sale, Including Relative Frequencies
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Class
|
Interval
|
Frequency
|
Relative Frequency
|
|
1
|
$1-$5
|
8
|
.25
|
|
2
|
$6-$10
|
6
|
.1875
|
|
3
|
$11-$15
|
4
|
.125
|
|
4
|
$16-$20
|
2
|
.0625
|
|
5
|
$21-$25
|
4
|
.125
|
|
6
|
$26-$30
|
6
|
.1875
|
|
7
|
$31-$35
|
2
|
.0625
|
|
The only difference between a frequency histogram and a relative frequency histogram is that the vertical axis uses relative or proportional frequency instead of simple frequency (see Figure
1 ).
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|
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Figure 1
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Relative frequency histogram of items sold at a garage sale.
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Statistics: Overview
Statistics: Graphic Displays
