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    vmuppa's Avatar
    vmuppa Posts: 2, Reputation: 1
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    #1

    Nov 2, 2011, 09:05 PM
    please help me solve this qustion
    Three machines X,Y,Z are produced respectively 50%,30%,and 20% of the total number of items in a factory.The output of these machines are 3%,4% and 5% respectively.If an item is selected at random,find
    1)The probability that the item is defective,
    2)Probability that the item is produced by machine X,machine Y,machine Z?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Nov 4, 2011, 02:05 AM
    1. Find each probability of:
    i. Item is from X and is defective.
    ii. Item is from Y and is defective.
    iii. Item is from Z and is defective.

    Add them up.

    2. Divide the probability of I by the total you got in 1. to get the probability that it came from X. Do the same for the others.
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