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?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.6: Summarizing Categorical Data
Problem 10CYU
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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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