Probability

jeff has 8 red marbles, 6 blue marbles, and 4 green marbles that are the same size and shape. he puts the marbles into a bag, mixes the marbles, and randomly picks one marble. what is the probability that the marble will be blue?

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  1. 6/18 = 1/3

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    Ms. Sue
  2. 7 A company has three machines A, B and C which all produce the same two parts, X and
    Y. of all the parts produced, machine A produces 60%, machine B produces 30%, and
    machine C produces the rest. 40% of the parts made by machine A are part X, 50% of the
    parts made by machine B are part X, and 70% of the parts made by machine C are part X.
    A part produced by this company is randomly sampled and is determined to be an X part.
    With the knowledge that it is an X part, find the probabilities that the part came from
    machine A, B or C.

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  3. The result of an exam score for a given class is normally distributed. If the mean score is
    85 points and the standard deviation is equal to 20 points, find the cutoff passing grade
    such that 83.4% of those taking the test will pass.

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  4. 45
    50
    602

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  5. 1000 blue mabrles 564 red mabrels and 200 green mabrels

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