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Relative Frequency Histogram

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 .

TABLE 1 Distribution of Items Sold at Garage Sale, Including Relative Frequencies

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 ).





Figure 1

Relative frequency histogram of items sold at a garage sale.


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