The probability of success in a single trial is 1/4. In 3 independent trials, the probability of getting exactly 1 success is:
The probability of success in a single trial is 1/4. In 3 independent trials, the probability of getting exactly 1 success is:
- A. 9/64
- B. 27/64
- C. 1/64
- D. 3/64
Answer: B) 27/64
Explanation: n=3, p=1/4, q=3/4, r=1. P(X=1) = ³C₁ (1/4)¹ (3/4)² = 3 × (1/4) × (9/16) = 27/64.
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