If the number of minutes that a doctor spends with a patient is a random variable having an exponential distri-bution with the parameter θ = 9, what are the probabili-ties that it will take the doctor at least 20 minutes to treat (a) one patient; (b) two patients; (c) three patients?

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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.