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You would need four buses. Three would be full and there would be six people on the last bus.
There are many more buses than passenger airplanes, so even though buses can be safer per passenger mile, there are more bus crashes. You WAY more likely to be in a bus crash, then in a plane crash. thousands, and thousands of car/automobile's crash every year. And only about a few hundred plane's crash a year.
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If the probability that a bus arrives on time 4 sevenths of a time, it means that for every 7 buses, 4 arrive on time. By deduction it also means that for every 7 buses 3 of them come late. If out of 7 buses 3 come late can you figure out how many buses out of 210 buses will be late based on the same probability? I am sure you can. Good luck!
planes are used for cargo shipping, passenger shipping, or just sight seeing.