Education: SAT and ACT Scores For a given population of high school seniors, the Scholastic Aptitude Test (SAT) in mathematics has a mean score of 520 with a standard deviation of 120. Another widely used test is American College Testing (ACT) exam. The mathematics portion of the ACT has a mean of 19 and a standard deviation of 7. Both SAT and ACT scores are normally distributed. What is the probability that a randomly selected high school senior's score on the mathematics part of the SAT will be
(a) more than 630?
(b) less than 425?
(c) between 425 and 630?
What is the probability that a randomly selected high school senior's score on the mathematics part of the ACT will be