A trial has a 0.2 probability of success on each independent attempt. What is the probability that the first success occurs on the third attempt?
Correct answer: B. 0.128
- A. 0.032
- B. 0.128
- C. 0.160
- D. 0.200
Explanation
The first two attempts must fail and the third must succeed. Thus, the probability is (0.8)^2 × 0.2 = 0.128, which is the geometric distribution formula for the third trial.
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