The numbers of miles run bike are 31 35 49 32 45 29 33 28 and 40 so determine the range of this data set?

To find the range of this data set, we first need to determine the difference between the largest and smallest numbers.

The largest number in the data set is 49 and the smallest number is 28.

So, the range is:
49 - 28 = 21

Therefore, the range of this data set is 21.