The numbers of miles Ron biked are 31, 35, 49, 32, 45, 29, 33, 28, and 40.

Determine the range of this data set.

The range of a data set is the difference between the largest and smallest values.

The largest value in this data set is 49 miles.

The smallest value in this data set is 28 miles.

Therefore, the range of this data set is:

49 - 28 = 21

So the range of Ron's miles biked is 21.

To find the range of a data set, you need to subtract the smallest value from the largest value.

The smallest value in the data set is 28 miles.
The largest value in the data set is 49 miles.

To find the range, subtract the smallest value from the largest value:
49 - 28 = 21

Therefore, the range of this data set is 21 miles.