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31 August, 15:47

A computer can be classified as either cutting dash edge or ancient. Suppose that 99 % of computers are classified as ancient. (a) Two computers are chosen at random. What is the probability that both computers are ancient ? (b) Five computers are chosen at random. What is the probability that all five computers are ancient ? (c) What is the probability that at least one of five randomly selected computers is cutting dash edge ? Would it be unusual that at least one of five randomly selected computers is cutting dash edge ?

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  1. 31 August, 15:49
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    Step-by-step explanation:

    a)

    probability of a computer being ancient =.99

    probability of a computer being cutting-edge =.01

    probability of two selected computer being old

    =.99 x. 99

    =.98 or 98%

    b)

    probability of 5 selected computers being old

    =.99 x. 99 x. 99 x. 99 x. 99

    =.95 or 95%

    c)

    probability that at least one of the five selected computers is cutting-edge

    = 1 - probability of 5 selected computers being old

    = 1 -.95

    =.05

    5 %
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