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  • Oct 31, 2013, 06:27 PM
    kmm23
    A deck of cards is shuffled, and I choose one at random, observe its color, and repla
    A deck of cards is shuffled, and I choose one at random, observe its color, and replace it in the set. The cards are thoroughly reshuffled, and I again choose a card at random, observe its color, and replace it in the set. This process is repeated until I get a red card with X denoting the number of draws required. The random variable X has which of the following probability distributions?

    A. The normal distribution, with mean 26 and variance 13
    B. The binomial distribution, with parameters n = 52 and p = 0.5
    C. The binomial distribution, with parameters n = 26 and p = 0.5
    D. None of the answers is correct
  • Nov 1, 2013, 12:37 PM
    Celine91
    This is a geometric distribution (experiment performed repeatedly until particular outcome is observed). A sequence of independent Bernoulli trials, each with probability of success p, and X number of the first trial at which a success is recorded. P(X = n) = (1-p)^n-1 * p

    so answer is none of the above.

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