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30 August, 15:37

A particular flight from city a to city b is on time 91% of the time. if 60 of these flights are made in a month, what is the probability that all of them are on time?

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  1. 30 August, 17:31
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    The events are independent (and less importantly mutually exclusive).

    This means that the probability that they are all on time is simply:

    (0.91) ⁶⁰ = 0.00348725 ...

    = 0.00349 (or 0.349 %)
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