A box contains a normal coin and a two headed coin. A coin is selected at random and tossed. If heads appear, the other coin is tested, if tails appear, the same coin is tossed. (a) Find the probability that heads appear on the second toss. (b) If heads appeared on the second toss, find the probability that it also appeared on the first toss.

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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.