A gymnast is planning which vault to perform at an upcoming competition. Her most difficult vault, vault #1, can earn her a 9.1. However, 75% of the time she does not
successfully complete it and is disqualified with zero points. Her other option, vault
#2, is a vault that can earn her 5.4 points, and she completes it 95% of the time.
Which vault should she choose? Explain.