A bookstore found out that 23 percent of their customers buy a book, 34 percent of their customers buy two books, 39 percent buy three books, and 4 percent buy four books. What is the average number of books the customers buy in that bookstore? What is the variance and standard deviation?
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.
A bookstore found out that 23 percent of their customers buy a book, 34 percent of their
customers buy two books, 39 percent buy three books, and 4 percent buy four books. What is
the average number of books the customers buy in that bookstore? What is the variance and
standard deviation?
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