SOLUTION: A random variable X has a binomial probability distribution with parameters n and p. The mean value is 3 and the variance is 1.2. Find the values of n and p and hence calculate, co

Question 631786: A random variable X has a binomial probability distribution with parameters n and p. The mean value is 3 and the variance is 1.2. Find the values of n and p and hence calculate, correct to three significant figures, P(X<4).
Answer by reviewermath(1029) (Show Source): You can put this solution on YOUR website!
If X~Binomial(n,p) then mean of X = np and Variance of X = npq where q = 1-p.
Therefore, np = 3 and npq = 1.2

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