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1 March, 06:58

Assume that the box contains 2 defective widgets and18 acceptable widgets. There are 5 inspectors, each of whom selects a widget from the box at random, inspects it, and then replaces it in the box. Each inspector makes his or her inspection at a different time.

What is the probability that at least one inspector will find a defective

widget?

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Answers (1)
  1. 1 March, 07:51
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    Probability that any one inspector finds a defective one is

    1/9 and doesn't find one is 8/9 so it should be 1 - (8/9) ^5
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