Suppose that on a comprehensive exam at the end of a master's degree program, each student must answer a total of 50 exam questions. Suppose that in the grading of each question there is an error which either awards 1 extra point or takes away 1 extra point, with equal likelihood. What is the expected net error?

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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.