*irrelevent to question(6.3/19)*   The vast majority of Visa and Discover Card credit cards have 16-digit card numbers. The first digit is either 4 (Visa) or 6 (Discover), digits 2 through 6 identify the issuer, digits 7 through 15 identify the customer, and the last digit is a "check digit" determined by the digits that precede it.† Your company, CreditXplosion, Inc., issues both Visa and Discover credit cards. (a) How many different CreditXplosion cards are possible? _____ cards   (b) How many different CreditXplosion Discover card numbers are possible in which the check digit is wrong? ____ card numbers

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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.