Assume that the store stocks 40 percent brand A, 40 percent brand B, and the rest are brand X. Assume further that 10 percent of brand A, 20 percent of brand B, and 35 percent of brand X will not provide the number of pages advertised. A customer buys a cartridge at random. If the customer returns the cartridge because it does not provide the number of pages advertised, what is the probability that the cartridge was brand X?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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 Assume that the store stocks 40 percent brand A, 40 percent brand B, and the rest are brand X. Assume further that 10 percent of brand A, 20 percent of brand B, and 35 percent of brand X will not provide the number of pages advertised. A customer buys a cartridge at random.

If the customer returns the cartridge because it does not provide the number of pages advertised, what is the probability that the cartridge was brand X?

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