Consider three independent experiments, whose probabilities for being finished within one hour are 0.9, 0.8 and 0.7, respectively. what is the probability that at most one experiment will be finished within one hour?
I'm guessing here, but it seems like a problem where you have to average it out. .9+.8+.7=2.4/3 (since there are 3 numbers) would be .8% chance of one finishing