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Math Help - Probabilities in Bernoulli Trials

  1. #1
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    Question Probabilities in Bernoulli Trials

    Find the expected value E(X) of a random variable X having the following probability distribution. (Enter an exact number as an integer, fraction, or decimal.)

    E(X) =


    x −2 1 4 7 10 13
    P(X = x)
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  2. #2
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    Re: Probabilities in Bernoulli Trials

    Quote Originally Posted by foz124 View Post
    Find the expected value E(X) of a random variable X having the following probability distribution. (Enter an exact number as an integer, fraction, or decimal.)

    E(X) =


    x −2 1 4 7 10 13
    P(X = x)
    Do you know what expected value means?
    If you do show us. If you do not, why are you trying to this question?
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  3. #3
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    Re: Probabilities in Bernoulli Trials

    Never mind, figured it out. = (-2*1/8)+(1*1/4)+(4*3/16)+(7*1/4)+(10*1/ = -2/8+1/4+12/16+7/4+10/16+13/8 = -4/16+4/16+12/16+28/16+10/16+26/16 = 76/16 = 19/4 = 4.75

    Thanks for the help though :s
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