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Please help as soon as possible Let X1, X2, X3, X4 be random variables that are all independent of each other and have the same

Please help as soon as possible

Let X1, X2, X3, X4 be random variables that are all independent of each other and have the same distribution, namely, P(X1 = 1) = 0.2, P(X1 = 0) = 0.8, and identically so for X2, X3, X4. Calculate the probability that P(X1 + X2 + X3 + X4

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