Question 49
ProbabilityThe probability that a student passes a Physics test is 2/3. If he takes three Physics tests, what is the probability that he passes two of the tests?
- A.4/9
- B.6/9
- C.4/27
- D.2/27
Show the answer and explanation
Answer: A (4/9)
Explanation
Exactly two passes can happen in 3 orders, each with probability (2/3)(2/3)(1/3) = 4/27. Total = 3 × 4/27 = 4/9.