Whooping cough (pertussis) is a highly contagious bacterial infection that was a major cause of childhood deaths before the development of vaccines. About 80%80% of unvaccinated children who are exposed to whooping cough will develop the infection, as opposed to only about 5%5% of vaccinated children. A group of 2020 children at a nursery school is exposed to whooping cough by playing with an infected child. (a) If all 2020 have been vaccinated, what is the mean number of new infections? (Enter your answer as a whole number.) mean number of new infections = (b) If none of the 2020 have been vaccinated, what is the mean number of new infections? (Enter your answer as a whole number.) mean number of new infections = What is the probability that 1818 or more of the 2020 children develop infections? (Enter your answer rounded to four decimal places.) probability =
Contingency Table
A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.
Binomial Distribution
Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.
Whooping cough (pertussis) is a highly contagious bacterial infection that was a major cause of childhood deaths before the development of vaccines. About 80%80% of unvaccinated children who are exposed to whooping cough will develop the infection, as opposed to only about 5%5% of vaccinated children.
A group of 2020 children at a nursery school is exposed to whooping cough by playing with an infected child.
(a) If all 2020 have been vaccinated, what is the mean number of new infections? (Enter your answer as a whole number.)
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