Probability 5 Question 2
2. Let a random variable have a binomial distribution with mean 8 and variance 4 . If , then is equal to
(2019 Main, 12 April I)
(a) 17
(b) 121
(c) 1
(d) 137
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Answer:
Correct Answer: 2. (d)
Solution:
- Let for the given random variable ’
’ the binomial probability distribution have -number of independent trials and probability of success and failure are and respectively. According to the question, Mean and variance
(given)