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Use an appropriate approximation to determine the probability that more than $120$ of these residents own a bicycle.
Mathematics 9709 · AS & A Level · The normal distribution
The normal distribution — practice question
In Millford, $70\%$ of residents have a bicycle. A random sample of $160$ residents is chosen.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The mean is $160 \times 0.7 = 112$ and the variance is $160 \times 0.7 \times 0.3 = 33.6$ (or an equivalent result).” …
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