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.
