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    newjerz00's Avatar
    newjerz00 Posts: 8, Reputation: 1
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    #1

    Mar 4, 2009, 04:35 PM
    statistics probability
    A shipment of 150 television sets contains 3 defective units. Find the probability of the vending company receiving (a) no defective units (b) all defective units and (c) at least one good unit?
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Mar 4, 2009, 04:40 PM
    How many TV's is the vending company getting? Is that given as well?

    For instance, it might read, "A shipment of 150 television sets contains 3 defective units. If the vending company buys 10, find the probability of them receiving (a) no defective units (b) all defective units and (c) at least one good unit?".
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    newjerz00 Posts: 8, Reputation: 1
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    #3

    Mar 4, 2009, 04:46 PM

    No it just says

    A shipment of 150 TV's contains 3 defective units. Find the probability of the vending company receiving (a) no defective units (b) all defective units and (c) at least one good unit

    so they want three answers
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    galactus Posts: 2,271, Reputation: 282
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    #4

    Mar 4, 2009, 04:48 PM
    Not much to it then. Wouldn't the prob. Of all defects be 3/150?

    How many are not defects? Then, the prob. Of no defects would be

    For 'at least one' defect, find the prob. Of no defects and subtract from 1.
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    newjerz00 Posts: 8, Reputation: 1
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    #5

    Mar 4, 2009, 04:54 PM

    That's what I had tried... or at least I think so..

    The answers they give me are

    a) 0.941 b)0.00000181 c)0.999998
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    galactus Posts: 2,271, Reputation: 282
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    #6

    Mar 4, 2009, 04:59 PM
    a. No defects:

    b. all defects:

    I still think there is a piece of info missing from this problem as I mentioned earlier.

    For 'at least one' good one, find the prob. Of no good ones and subtract from 1. But that is part a.

    There is definitely something missing. I can tell from the answers you were given.
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    newjerz00 Posts: 8, Reputation: 1
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    #7

    Mar 4, 2009, 05:02 PM

    Thank youuu tons of help!
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #8

    Mar 4, 2009, 05:10 PM
    Your problem should be:

    "A shipment of 150 television sets contains 3 defective units. If the vending company buys 3, find the probability of the vending company receiving (a) no defective units (b) all defective units and (c) at least one good unit?

    all defects:

    no defects:
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