Problem 12. (25 %) Let X_i, 1 ≤ i ＜ 4 be independent Bernoulli random variable each with mean p = 0.1. Let X = That is, X is a Binomial random variable with parameters n = 4 and p = 0.1. Then,
(A)E[X₁ | X=2]=0.1
(B)E[X₁ | X= 2]=0.5
(C)[X₁ | X=2]= 0.25

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