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Hey I'm confused about how to do this kind of problem. I can't figure out how to find the standard deviation.

There are on average 4 tetanus cases reported in the US each month. What is the probability that at most 3 cases will be reported in any given month? What is the probability that 2 cases will be reported? What is the probability that 10 or more cases will be reported? What is the standard deviation of the number of cases per month?

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You have to assume that the number of tetanus cases reported follows a Poisson distribution with $\lambda=4$.

Now using the Poisson distribution you can find out the given probabilities easily, and also the standard deviation.

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