Refer to the Chance (Winter 2001) study of students who paid a private tutor to help them improve their SAT scores, presented in Exercise. The table summarizing the changes in both the SAT-Mathematics and SAT-Verbal scores for these students is reproduced here. Assume that both distributions of SAT score changes are approximately normal.

a. What is the probability that a student increases his or her score on the SAT-Math test by at least 50 points?
b. What is the probability that a student increases his or her score on the SAT-Verbal test by at least 50 points?

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SAT-Math SAT-Verbal Mean change in score Standard deviation 19 of changes in score 65 49