If we assume the distribution of pilot talent for a Max 737 is symmetrical, then mean=median so the tests only require the better half of pilots land the plane.
Which is a pretty bad standard.
A better standard is that the 20% percentile commerical pilot can land the plane.
The Max needs to ensure that 80% ("average" is too low a standard) of tested pilots recover the plane.
The other 20% take remedial classes.