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Consider all of a class of companies with a similar probability of default. Assume that the...

Consider all of a class of companies with a similar probability of default. Assume that the probability that any one company defaults is independent of the probability that the others default. If we expect that three companies will default on their debt in March 2019, what is the approximate probability that no more than 1 company defaults?

So far I have noted that E(x) = 3, the probability that any one company defaults = 1/n because they have similar probabilities of default and we will have n number of companies. I also believe this is a Binomial distribution

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