A random variable X has binomial distribution with n = 10 and p = 0.3 then variance of X is:_____________________?
Correct answer: C. 2.1
- A. 10
- B. 12
- C. 2.1
- D. 21
- E. None
Explanation
For a binomial variable, variance is npq, where q = 1 - p. Here, npq = 10(0.3)(0.7) = 2.1.
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