13. Below is given the summary from the 112th Congress of Senators whose terms end in 2013, 2015, and 2017: Total the columns and rows and find the requested probabilities 2013 2015 - 2017. Total Democrat 21 20 1 36 Na78 a. Find the probability that the senators term expires in 2015. Republican Total 8 15 13 29 35 14 338 20 b. Find the probability that the senator is a Democrat 192 c. Find the probability that the senator is a Republican or the senator's term expires in 2013.

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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.