Methods2024 NHT Exam 1 · Q7Tech-free3 marks

Discrete random variable with a geometric-type pmf

Let $X$ be a discrete random variable with a probability mass function of $\Pr(X = x) = \dfrac{2}{3^x}$ , where .

Find $\Pr(X = 4)$ .

1 mark

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Find $\Pr(X < 4 \mid X \geq 2)$ .

2 marks

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