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?
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 %)
