7 On any given day, the probability that Moena messages her friend Pasha is 0.72 .
- Find the probability that for a random sample of 12 days Moena messages Pasha on no more than 9 days.
- Moena messages Pasha on 1 January. Find the probability that the next day on which she messages Pasha is 5 January.
- Use an approximation to find the probability that in any period of 100 days Moena messages Pasha on fewer than 64 days.
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