Question

The number line below represents all the possible distances, in miles, Peter runs each week while preparing for a race.

Answer 1

For this case what you should see in the line of numbers are all values highlighted from 15 to 19.
 Which means that Peter runs every week between 15 and 19 miles.
 The average is approximately 17 miles per week, however, the solution shown on the line varies from 15 to 19 miles.
 answer:
 Peter always runs between 15 miles and 19 miles each week.