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Math Help - PROB/STAT help

  1. #1
    niknik01
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    PROB/STAT help

    1.There are 12 apples in a bag. Four of them have worms in them. Two apples are pulled from the bag at random, find the probability that neither has a worm in it.

    2.A company car pool consists of 40% fords, 20% chryslers and 40% Hondas. While each honda has a passenger side airbag, only 50% of the fords and 60% of the chryslers do. A car is selected at random from the car pool. Determine the probability that it has a passenger side airbag.

    i know these are easy but, this class is hard any help will help
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  2. #2
    MHF Contributor

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    How many ways can one pick two ‘good’ apples?
    How many ways can one pick two any apples?
    Now divide.
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  3. #3
    Junior Member
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    let A = good apple. 8/12= P(A)
    b = bad apple.4/12 =P(A^c)
    p(B|A)= probability second apple is bad one given that the first apple is good =4/12

    p(B|A^c)=8/11 eleven it is not but back at the bag

    p(B^c|A)= 7/11 eleven it is not but back at the bag
    p(B^c|A^c) =3/11 eleven it is not but back at the bag

    p(B) =P(B|A)P(A)+p(B^c|A)P(A^c)
    = 4/12.8/12+7/11.4/12=
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