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3 December, 01:56

A manufacturer of computer disks has a historical defective rate of. 001. what is the probability that in a batch oof 1000 disks, 2 would be defective?

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  1. 3 December, 02:42
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    P (2 defective) = 1000C2 * (.001²) * (.999⁹⁹⁸)

    ... ≈ 499,500*10⁻⁶*0.368432

    ... ≈ 0.18403

    About 18.4%.
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