Suppose that the respective probabilities are 0.4, 0.3, 0.2, and 0.1 that there will be 0, 1, 2, or 3 power failures in a certain city during the month of July. What is the probability of having at least 2 power failures in the city during July?
1) 0.1
2) 0.2
3) 0.3
4) 0.4
