In a recent survey, 8 people were each as the number of times they have been on an airplane. Here is a list of the responses 10, 9, 14, 21, 9, 12, 15, 23

The range is 17

Step-by-step explanation:

First order the data from least to greatest.

25, 14, 9, 20, 16, 8, 12, 8

↓

8, 8, 9, 12, 14, 16, 20, 25

Now the range R is defined as the difference between the highest and the lowest value of the data set:

Once the data is ordered from least to greatest, it can be clearly seen that the highest value is 25 and the lowest value is 8. Then the R is: R=25-8

R=17