Answer:
A MCAT score that is significantly high is a score of at least 38.
A MCAT score that is significantly low is at most 12.4.
Explanation:
The z-score formula is given by:

In which
is the mean and
is the standard deviation.
In this problem, we have that:

Significantly high if it has a zscore of at least 2




A MCAT score that is significantly high is at least 38.
Significantly low if it has a score of at most - 2




A MCAT score that is significantly low is at most 12.4.