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9709 P51 - Nov 2022 - Q2
3352

The residents of Persham were surveyed about the reliability of their internet service. 12% rated the service as ‘poor’, 36% rated it as ‘satisfactory’ and 52% rated it as ‘good’.

A random sample of 125 residents of Persham is now chosen.

Use an approximation to find the probability that more than 72 of these residents rate their internet service as good.

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