Stenographer’s typos. A very skilled court stenographer makes one typographical error (typo) per hour on average. (a) What are the mean and the standard deviation of the number of typos this stenographer makes in an hour? (b) Calculate the probability that this stenographer makes at most 3 typos in a given hour. (c) Calculate the probability that this stenographer makes at least 5 typos over 3 hours.

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