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9709 P51 - Nov 2021 - Q7
3115

The times, in minutes, that Karli spends each day on social media are normally distributed with mean 125 and standard deviation 24.

(i) On how many days of the year (365 days) would you expect Karli to spend more than 142 minutes on social media?

(ii) Find the probability that Karli spends more than 142 minutes on social media on fewer than 2 of 10 randomly chosen days.

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