In Scotland, in November, on average 80% of days are cloudy. Assume that the weather on any

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In Scotland, in November, on average 80% of days are cloudy. Assume that the weather on any one day is independent of the weather on other days.

i. Use a normal approximation to find the probability of there being fewer than 25 cloudy days in Scotland in November (30 days).

ii. Give a reason why the use of a normal approximation is justified.

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