What is the mean of 9, 8, -15 and -12?

The Mean is:

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.

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

Three consecutive integers have a sum of 234. what are the three integers