What is the range of the set of numbers: 5, 10, 15, 20?

To determine the range of a set of numbers, you subtract the smallest number in the set from the largest number. In the given set—5, 10, 15, and 20—the largest number is 20 and the smallest number is 5.

Calculating the range involves performing the following operation:

Range = Largest number - Smallest number

Range = 20 - 5

Range = 15

Thus, the range of the set of numbers is 15, which is why this answer is correct. Understanding the concept of range is essential in mathematics, as it provides insight into the spread of values within a dataset, and recognizing the maximum and minimum values is a fundamental component in determining this measure.