Suppose that 30% of all students who have to buy a text for a particular course want a new copy, whereas the other 70% want a used copy. Consider random selected 25 purchases. (a) What is the probability that the number who wants new copies is more that two standard deviations away from the mean value? (b) The bookstore has 15 new copies and 15 used copies in stock. If 25 people come in one by one to purchase this text, what is the probability that all 25 will get the type of book that want from the current stock?
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.
Suppose that 30% of all students who have to buy a text for a particular course want a
new copy, whereas the other 70% want a used copy. Consider random selected 25
purchases.
(a) What is the probability that the number who wants new copies is more that two
standard deviations away from the
(b) The bookstore has 15 new copies and 15 used copies in stock. If 25 people come in
one by one to purchase this text, what is the probability that all 25 will get the type of
book that want from the current stock?
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