Shota built a time travel machine, but he can't control the duration of his trip. Each time he uses the machine he has a 0.8 probability of staying in the alternative time for more than an hour. During the first year of testing, Shota uses his machine 20 times.

**Assuming that each trip is equally likely to last for more than an hour, what is the probability that at least one trip will last less than an hour?**

Round your answer to the nearest hundredth.

P(at least one<1 hour)=_____

Guest Nov 27, 2018