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June 2023 p51 q6
2974

Eli has four fair 4-sided dice with sides labelled 1, 2, 3, 4. He throws all four dice at the same time. The random variable X denotes the number of 2s obtained.

(a) Show that \(P(X = 3) = \frac{3}{64}\).

(b) Complete the following probability distribution table for \(X\).

x01234
P(X = x)\(\frac{81}{256}\)\(\frac{3}{64}\)\(\frac{1}{256}\)

(c) Find \(E(X)\).

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