Question: Typographic errors. Return to the proofreading setting of Exercise 5.13. (a) What is the mean number of errors caught? What is the mean number of

Typographic errors. Return to the proofreading setting of Exercise 5.13.

(a) What is the mean number of errors caught?

What is the mean number of errors missed? You see that these two means must add to 10, the total number of errors.

(b) What is the standard deviation σ of the number of errors caught?

(c) Suppose that a proofreader catches 90% of word errors, so that p = 0.9. What is σ in this case? What is σ if p = 0.99? What happens to the standard deviation of a binomial distribution as the probability of a success gets close to 1?

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