SOLUTION: Let A be the event that a student is enrolled in an accounting course, and let S be the event that a student is enrolled in a statistics course. It is known that 30% of all studen

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Question 1083652: Let A be the event that a student is enrolled in an accounting course, and let S be the event that a student is enrolled in a statistics course. It is known that 30% of all students are enrolled in an accounting course and 40% of all students are enrolled in statistics. Included in these numbers are 15% who are enrolled in both statistics and accounting. A student is randomly selected, what is the probability that the student is enrolled in either accounting or statistics or both?
Answer by Boreal(15235) About Me  (Show Source):
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P(S OR A)=P(S)+P(A)-P(S AND A); the last takes care of double counting.
=0.3+0.4-0.15=0.55.