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the random variable X can only assume the values 3, 4, 7, 8, and 9. You know the following values of the probability function: px(3)

the random variable X can only assume the values 3, 4, 7, 8, and 9.

You know the following values of the probability function:

px(3) = 1/3, px(4) = 1/4, px(7) = 1 / 6, px(8) = 1/6.

Caluculate:

px(9)

Fx(5)

P(4X8)

I don't understand this...

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