The number of people arriving for treatment at an emergency room can be modelled by a Poisson proces ith a rate parameter of five per hour. a) What is the probability that exactly four arrivals occur during a particular hour? b) What is the probability that at least four people arrive during a particular hour? c) How many people do you expect to arrive during a 45-min period?

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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.