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9709 P51 - Jun 2023 - Q6
3335

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.

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

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

Eli throws the four dice at the same time on 96 occasions.

(d) Use an approximation to find the probability that he obtains at least two 2s on fewer than 20 of these occasions.

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