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12 April, 11:10

Chips suppose a computer chip manufacturer rejects 2% of the chips produced because they fail presale testing.

a. what's the probability that the fifth chip you test is the rst bad one you nd?

b. what's the probability you nd a bad one within the rst 10 you examine?

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  1. 12 April, 11:25
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    (a) P (fifth one is bad) = P (first 4 are OK) * P (5th is bad)

    = (0.98) ^4 * 0.02 = 0.0184 or 1.84%

    (b) this will be (0.98) ^10 = 81.70%
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