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Math Help - probability distribution

  1. #1
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    Apr 2008
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    Arrow probability distribution

    i have been given this question

    A whole saler buys items at 35 each. the whole saler sells these in batches of 7 to retailers at 54 per item. It is Known that, on average, 16 items in a thousand are faulty.

    (a) Construct the probability distribution table for the number of faulty items in a batch of 7 items. all probability values must be rounded off to 5 decimal places.

    please can you help me
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  2. #2
    Member
    Joined
    Aug 2007
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    144
    X = "Faulty~Items"
    X \sim B(7,0.016)

    Now construct a table using the formula;
     ^nC_r~\cdot~(1-p)^{n-r}~\cdot~p^r

    With;
    0,~P(X=0)
    1,~P(X=1)
    2,~P(X=2)

    Up to 7.
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