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

    Jun 20, 2011, 10:55 AM
    Probability
    A hamburger chain found that 75% of all customers use mustard, 80% use ketchup, and 65% use both, when ordering a hamburger. What are the probabilities that
    a) A ketchup-user uses mustard?
    b) A mustard-user uses ketchup?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Jun 20, 2011, 12:05 PM

    What have you tried? Did you draw a Venn diagram or a probability tree to help you?
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