Question: 12.34 to 12.37 are based on this information. 12.34 Vaccination at work. A group of 20 children at a nurs ery school are exposed to

12.34 to 12.37 are based on this information.

12.34 Vaccination at work. A group of 20 children at a nurs ery school are exposed to whooping cough by playing with an infected child.

(a) If all 20 have been vaccinated, what is the mean number of new infections? What is the probability that no more than 2 of the 20 children develop infections?

(b) If none of the 20 have been vaccinated, what is the mean number of new infections? What is the probability that 18 or more of the 20 children develop infections?

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