I have this question in a mock exam:
A salesman makes 10 calls per hour. On each call, he completes a sale with probability 0.08. What is the probability he makes 2 or more successful calls in 1 hour?
I don't know how to answer this, I thought I could use X~Bin(10,0.8) and calculate the probability based on 1 - (Pr(x=0) + Pr(x=1)) but this doesn't work... How should I answer this?