Combined Events and Conditional Probability Quiz
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5 questions, one answer each
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1. Two events A and B are mutually exclusive. Event A has probability 0.3 and event B has probability 0.5. What is P(A or B)?
- A. 0.8
- B. 0.15
- C. 0.65
- D. 1.0
2. A fair coin is flipped twice. What is the probability of getting at least one heads?
- A. 0.25
- B. 0.5
- C. 0.75
- D. 0.125
3. A bag contains 5 red balls and 3 blue balls. A ball is drawn, not replaced, then another is drawn. What is P(both red)?
- A. 25/64
- B. 25/56
- C. 10/64
- D. 5/8
4. In a group, 40% of people own a dog, 30% own a cat, and 15% own both. A person is selected at random. What is the probability they own a dog or a cat?
- A. 0.45
- B. 0.55
- C. 0.70
- D. 0.85
5. A student has probability 0.7 of passing Biology and probability 0.6 of passing Chemistry. Assuming these are independent events, what is the probability of passing both?
- A. 1.3
- B. 0.42
- C. 0.13
- D. 0.18