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Type of electronic component ships

A producer of a cartain type of electronic component ships to suppliers in lots of twenty. Suppose that 60% of all such lots contain no defective components and 30% contain one defective component and 10% contain two defective components.

A. If a lot has only one defective unit, what is the probability that you would randomly choose two non-defective parts.

B. What is the probability of selective two non-defective parts in a randomly selected lot?

C. Based on the selection of two non-defective parts, what is the probability that one defective exists in a lot?

D. What probability distribution best model the number of defectives per lot?

Estimate the model parameters based on you answer to part c.

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In a test of weld strength, 80% of tests result in a fracture in the weld,while 20% result in fracture in the beam. Let X denotes the number of failed trials that precede the 3rd beam fracture.