EXAMPLE 1 Frequency distributions

Create a frequency distribution for the variable app type from Table 1.

Solution

For each app type, we compute the frequency; that is, we count (or tally) how many apps were of that particular app type. Table 2 shows the frequency distribution for the variable app type. For example, five of the apps were social networking apps. The frequency distribution summarizes the data set so that quick observations can be made, such as “The most popular app type in the Apple.com top 20 list of the most downloaded free apps is the Games app type.”