Does one measure describe the data better than the others now? (mean-median)

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.

What is the range for 31,39,29,34,37,24,36,33,34,28

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b