Math 312 Exam
Math 312 Exam
Answer questions 2 – 5 with either True or False. If your answer is False, you must provide an
explanation in order to receive full credit for the question. (2 points each)
2. An event that CANNOT happen has a negative probability.
3. If Y is impossible, the probability of not Y is one.
4. If a fair die is rolled once, the probability that you get a four, given that the die comes up
an even number, is one-sixth.
5. If A and B are disjoint events, then P(A or B) = P(A) + P(B).
6. (2 points) A bag has only red balls and green balls. The experiment is to draw one ball from the bag without looking. What does it mean to say, “The probability of getting a green ball is 40%”?
7. A) (1 pt) The theoretical probability of getting red for the spinner below is_______. (The
spinner is a regular pentagon.)
DETAILED ASSIGNMENT
