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9 August, 12:07

Assume that when adults with smartphones are randomly selected, 42 % use them in meetings or classes. If 30 adult smartphone users are randomly selected, find the probability that exactly 24 of them use their smartphones in meetings or classes.

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  1. 9 August, 15:59
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    0.00205%

    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).

    n = 30, r = 24, p = 0.42, and q = 0.58.

    P = ₃₀C₂₄ (0.42) ²⁴ (0.58) ³⁰⁻²⁴

    P ≈ 0.00205%
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