Scores are obtained from the Law School Admission Test (LSAT) are normally distributed with a mean score

Question:

Scores are obtained from the Law School Admission Test (LSAT) are normally distributed with a mean score of 550 and a standard deviation of 110.
If a test score is selected at random, find the probability that it is less than 750.
If the top 15% of the test scores are usually good enough for admission to law school, find the cut off score for gaining admission.