(a)[2]
Find the value of $P(X < 8)$.
(b)[2]
Find the probability that Nicola gets a 6 for the second time on her 8th throw.
Mathematics 9709 · AS & A Level · Discrete random variables
Discrete random variables — practice question
Nicola rolls a fair ordinary six-sided dice. The random variable $X$ represents how many throws she needs to obtain a 6.
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Applies $P(X<8)=1-\left(\frac{5}{6}\right)^7$ or a matching method” …
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