Question 717102
This is a binomial probability problem. The probability of a "success" is p = 0.2 since we want to determine the likelihodd of breakdown.  
The general formula for the probability of m successes in n trials is:
P(m) = combin(n,m)*p^m*(1-p)^(n-m)
In this case there are 10 trials, so n = 10
P(2 or more) = 1 - P(less than 2)
P(0) = 0.107374
P(1) = 0.268435
So P(2 or more) = 1 - .1074 - 0.2684 = 0.6242 (D)