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In a binomial distribution, mean is 18 and variance is 12 then p = ….

Options

  1. A2 3
  2. B1 3
  3. C3 4
  4. D1 2

Correct answer

B. 1 3

Step-by-step solution

We know that, mean = n p = 18 and variance = n = p q = 12 Now, 2 p q n p = 12 18 ⇒ q = 2 3 ∴ p = - 1 q = 1 - 2 3 = 1 3

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