AP STATS Free Response Help?

Not sure how to approach these 2 questions (A), (B).... The distribution of scores on a recent test closely followed a Normal distribution with a mean of 22 points and a standard deviation of 4 points. (A) What proportion of the students scored at least 25 points on this test? (B) What is the 31st percentile of... show more Not sure how to approach these 2 questions (A), (B)....

The distribution of scores on a recent test closely followed a Normal distribution with a mean of 22 points and a standard deviation of 4 points.
(A) What proportion of the students scored at least 25 points on this test?
(B) What is the 31st percentile of the distribution of test scores?

Please show how you got your answer, thanks!
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