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Suppose a company produces widgets and has a 20% defective rate. What is the probability that 3 out of 10 randomly selected widgets are defective?

Suppose a company produces widgets and has a 20% defective rate.
What is the probability that 3 out of 10 randomly selected widgets are defective?
What is the probability that 6 or more out of the 10 randomly selected widgets are defective?
What is the probability that the first defective widget occurs on the fourth one selected?

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