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Random variable a is the total number of successes in 7 repeated Bernoulli trials. Each trial is independent of each other, and the the probablety

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Random variable a is the total number of successes in 7 repeated Bernoulli trials. Each trial is independent of each other, and the the probablety of success on a single trial, p = 0.7, is the same from trial to trial. What is the expected value and the variance of x? E(E) = Var(I) = Compute the probability that x is at most 4. Probability =

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