### Find the probability of mean and variance of x

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A bias coin is tossed four times. If probability of head in a single toss is 0.61, find the probability of

b. Suppose X is a binomial random variable with n = 10 and p = 0.5,find
i. mean and variance of X.
ii. P(X = 5).
iii. P(X <= 4).

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