Which function has a constant additive rate of chan of -1/4

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.

8.74 rounded to the nearest whole number

What type of symmetry does a rhombus have?