A consumer electronics company with 100 stores sells multiple brands of cell phones. Forty of their stores carry 20% iPhones and 80% other brands, and sixty of their stores carry 50% iPhones and 50% other brands. If a store is selected at random, and a phone is purchased from that store at random, what is the marginal probability the phone purchased is an iPhone?
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 consumer electronics company with 100 stores sells multiple brands of cell phones. Forty of their stores carry 20% iPhones and 80% other brands, and sixty of their stores carry 50% iPhones and 50% other brands.
If a store is selected at random, and a phone is purchased from that store at random, what is the marginal
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