How to determine the rate of change from a table

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

Which representation has a constant of variation of -2.5

The graph shows the distance kerri drives on a trip. what is kerri's speed . a. 25 b.75 c.60 d.50