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10 January, 11:29

assume that when adults with smartphones are randomly selected, 45% use them in meetings or classes. If 6 adult smartphone users are randomly selected, find the probability that exactly 3 of them use their smartphones in meetins or classes.

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  1. 10 January, 11:39
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    0.3032

    Step-by-step explanation:

    Use binomial probability.

    P = nCr p^r q^ (n-r)

    where n is the number of trials,

    r is the number of successes,

    p is the probability of success,

    and q is the probability of failure (1-p).

    P = ₆C₃ (0.45) ³ (0.55) ³

    P = 0.3032
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