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A certain type of aluminum screen 2 feet in width

A certain type of aluminum screen 2 feet in width has, on the average, three flaws in a l00-foot roll.

(a) What is the probability that the first 40 feet in a roll contain no flaws?

(b) What assumption did you make to solve part (a)?

(a) What is the probability that the first 40 feet in a roll contain no flaws?

(b) What assumption did you make to solve part (a)?

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