9. Judging from recent experience, 5% of the computer keyboards produced by an automatic,

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 1.     Judging from recent experience, 5% of the computer keyboards produced by an automatic, high-speed machine are defective. If six keyboards are randomly selected, what is the probability that none of the keyboards are defective? Use binomial distribution.

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0.167

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0.500

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0.735

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0.001
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