Mathematics 9709 · AS & A Level · Linear combinations of random variables

Linear combinations of random variables — practice question

A loaded die has six faces, labelled $1$ to $6$. For this die, the chance of getting $1$, $3$ or $5$ is $0.1$ each. The chance of getting $2$ or $4$ is $0.2$ each. The die is rolled two times.
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Work out the probability that the total of the two numbers shown is $9$.

Worked solution & mark scheme

This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: States that $P(6)=0.3$

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