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Today Nicole from Lenmore, CA, asked this question:   There are 5000 tires made including 200 that are defective if 4 tires are randomly selected, what is the probability that they are good?   Asked to use the method of redundancy but I'm having a hard time understanding how to write the equation and solve the problem.   The Wheeling Tire Company produced a batch of 5000 tires that includes exactly 200 that are defective.   a) If 4 tires are randomly selected for installation on a car, what is the probability that they are all good?   b) If 100 tires are randomly selected for shipment to an outlet, what is the probability that they are all good? Should the outlet plan to deal with defective tires returned by their customers?   And here's how I answered:   Hi Nicole, thanks for asking. Here's how I would do this problem. 1. Define your variables T= total number of tires D... read more

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