1. The problem statement, all variables and given/known data A smoke detector has a 92% chance of functioning properly. If there are 3 of these, what are the chances at least one of them will go off during a fire? 2. Relevant equations Standard binomial distribution I believe. X~B(n, p) 3. The attempt at a solution P(X>=1) = P(X=3)+P(X=2)+P(X=1) When placing this into the equation I end up with ~0.996. Can someone verify?