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Math Help - probability

  1. #1
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    probability

    A firm that produces jewelry knows that 10% of its products have some flaws and must be classified as "cheap"

    -Among six random selected pieces of jewelry, how likely is that only one is "cheap"?
    -Among six randomply selected pieces of jewelry, what is the probability that at least two are "cheap"?
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  2. #2
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    Quote Originally Posted by Andreamet View Post
    A firm that produces jewelry knows that 10% of its products have some flaws and must be classified as "cheap"

    -Among six random selected pieces of jewelry, how likely is that only one is "cheap"?
    -Among six randomply selected pieces of jewelry, what is the probability that at least two are "cheap"?
    Let X be the random variable number of cheap pieces of jewelry.

    X ~ Binomial(n = 6, p = 1/10)

    You want:

    Pr(X = 1).

    \Pr(X \geq 2) = 1 - \Pr(X = 1) - \Pr(X = 0).
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