Why is the acceptance rate of Medical Schools astoundingly low?

I understand that medical schools must be extremely picky in who they accept, but I recently learned that 50% of average MCAT scorers were accepted and 50% were not. Even in the 80% percentile (above average), around 33% of the students were not accepted into any schools. Is this due to the total college... show more I understand that medical schools must be extremely picky in who they accept, but I recently learned that 50% of average MCAT scorers were accepted and 50% were not. Even in the 80% percentile (above average), around 33% of the students were not accepted into any schools. Is this due to the total college extra-curricular activities taken part in or is there more that I am missing?
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