During the early morning hours, customers arrive at a branch post office at an average rate of 15 per hour (Poisson), while clerks can provide services at a rate of 5 per hour. If clerk cost is $38.22 per hour and customer waiting time represents a cost of $39 per hour, how many clerks can be justified on a cost basis a. 8 b. 4 c. 7 d. 6 e. 5

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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.