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b 56 An unbalanced die is rolled. Let X stands for the number shown up at the top. X has the following probability function:

b 56 An unbalanced die is rolled. Let X stands for the number shown up at the top. X has the following probability function: X 1 2 3 4 P(X) b a a a 1) Given that E(X) = 4.2, find the values of a and b. Answer: 0.3 69 2) Write down the cumulative distribution function Answer:

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