A certain computer virus can damage any file with probability 35%, independently of other files. Suppose this virus enters a folder containing 2400 files. Compute the probability that between 800 and 850 files get damaged.
I'm not interested in so much the exact answer as much as I am into how to solve this type of problem. We are working with Poisson distribution and standard deviation which I haven't even figured out how I can even apply to this problem, or if it's even the correct path towards the solution.