Mathematics 0580 · IGCSE · Probability of combined events

Probability of combined events — practice question

Maria uses a fair 7-sided spinner numbered 1 to 7.
(a)[2]

Explain why the chance that the spinner stops on a prime number is $\frac{4}{7}$.

(b(i))[2]

Complete the tree diagram.

(b(ii))[2]

Work out the probability that the spinner lands on a prime number both times.

Worked solution & mark scheme

This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Prime numbers $2,3,5,7$ only; $7$ possible outcomes” …

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