Question

roxanne completed her first half - marathon, or 13.1 - mile race, in less than 2.5 hours. she pressed the lap timer on her watch as she passed each mile marker so that after the race, she could look at her mile times. her fastest mile was completed in 9.5 minutes, while the slowest took 11.5 minutes. her median mile time was 10.5 minutes, and the interquartile range was 1 minute. which is a measure of how much roxannes mile times varied? 1 minute 9.5 minutes 10.5 minutes 11.5 minutes

Explanation:

The inter - quartile range (IQR) is a measure of variability. Given that the IQR of Roxanne's mile times is 1 minute, this value represents how much her mile times varied. The other values (9.5 minutes, 10.5 minutes, 11.5 minutes) are individual mile - times or the median, not measures of variability.

Answer:

1 minute