(a)[3]
Prepare the probability distribution table for $X$.
(b)[3]
Determine $\mathrm{E}(X)$ and $\mathrm{Var}(X)$.
Mathematics 9709 · AS & A Level · Discrete random variables
Discrete random variables — practice question
A balanced 6-sided die has the faces marked $1, 2, 2, 3, 3, 3$. It is thrown twice. The random variable $X$ stands for the sum of the two numbers shown.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A table containing the correct $x$ values and at least one probability” …
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