CUET · MATHS · PYQ PAPER 2023
In a binomial distribution, the probability of getting success is \(1 / 4\) and standard deviation is 3 . Then it's mean is:
- A 6
- B 8
- C 12
- D 10
Answer & Solution
Correct Answer
(C) 12
Step-by-step Solution
Detailed explanation
\(\sigma = \sqrt{np(1-p)}\) \(3 = \sqrt{n(1/4)(3/4)}\) \(9 = n(3/16)\) \(n = 9 \times 16 / 3 = 48\) \(\mu = np\) \(\mu = 48 \times (1/4) = 12\)
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