To find the relative frequency, we use the following frequency distribution table and formula. To find that **relative frequency** Divide the frequency of this category by the sum of all frequencies. We can express the relative frequency using a mathematical formula.

Relative frequency of a category

Frequency of this category

Sum of all frequencies

The above table is a frequency table of the smartphone type. Let’s find the relative frequency for the categories you can see above.

Relative frequency of the Android phone

12th

40

= 0.3

Window phone relative frequency

8th

40

= 0.2

Relative frequency of the Iphone

fifteen

40

= 0.375

Relative frequency of the Amazon fire phone

5

40

= 0.125

A relative frequency distribution is a table that shows the relative frequency for **all** Categories as shown below.

Note that the sum of the relative frequencies is always equal to 1.

The percentage of a category is found by multiplying the relative frequency of that category by 100.

Android phone percentage = 0.3 × 100 = 30%

Relative frequency of the window phone = 0.2 × = 20%

Relative frequency of Iphone = 0.375 × 100 = 37.5%

Iphone relative frequency = 0.125 × 100 = 12.5%

Since the relative frequency of Windows phones is 20%, we can conclude that 20% of the people in the sample said they owned a Windows phone.