Anonymous
Anonymous asked in Science & MathematicsMathematics · 2 years ago

A fair coin is tossed 15 times. What is the probability that exactly 3 heads occur?

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  • 2 years ago
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    Binomial probability formula:

    P(X=k) = C(n,k) * p^k * q^(n-k)

    n : number of trials (15)

    k : number of successes (3)

    p : probability of success (½)

    q : probability of failure (½)

    = C(15,3) * ½^3 * ½^12

    = C(15,3) * ½^15

    = 455/32768

    ≈ 0.0139

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  • 2 years ago

    i see how it works now. thank you so much

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