Mathematics 0580 · IGCSE · Relative and expected frequencies

Relative and expected frequencies — practice question

A bag contains $7$ red discs, $5$ green discs and $2$ pink discs. Helen chooses one disc at random, notes the colour and then puts it back into the bag. She repeats this $140$ times.
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Find the number of times she would expect to take a green disc.

Worked solution & mark scheme

This 2-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Hence, $\frac{140}{7 + 5 + 2} = 50$.” …

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