To find the range of a data set, you subtract the smallest number from the largest number.
In the data set provided, the numbers of miles Ron biked are:
31, 35, 49, 32, 45, 29, 33, 28, and 40.
- Identify the smallest number: The smallest number is 28.
- Identify the largest number: The largest number is 49.
Now, calculate the range:
\[ \text{Range} = \text{Largest number} - \text{Smallest number} = 49 - 28 = 21 \]
Therefore, the range of the data set is 21 miles.