In a set of data, if the smallest number is 5 and the largest number is 15, what is the range?

To find the range of a set of data, you subtract the smallest number in the set from the largest number. In this case, the smallest number is 5 and the largest number is 15.

Calculating the range involves the following steps:

1. Identify the largest number, which is 15.
2. Identify the smallest number, which is 5.
3. Subtract the smallest number from the largest number: 15 - 5 = 10.

This calculation shows that the range of the data set is 10, indicating the span or difference between the smallest and largest values. Thus, the correct answer, which reflects this calculation, is 10.