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A certain make of cloth has on the average one defect per 20 square meters. a. What is the probability that a roll, 2 meters

A certain make of cloth has on the average one defect per 20 square meters.

a. What is the probability that a roll, 2 meters wide and 30 meters long, will have one defect?

b. Five persons buy one roll each of this cloth. What is the probability that no one will buy a roll with defects?

c. If 5 rolls were selected, what is the probability that 3 rolls will have 2 defects each?

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