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25 February, 09:37

Box contains the following numbered tickets: 1,1,5,9,9 a) If I draw two tickets with replacement, what is the chance that the sum of the two tickets is greater than or equal to 10?

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  1. 25 February, 12:55
    0
    17/25

    Step-by-step explanation:

    The probability of drawing 1 = 2/5

    The probability of drawing 5 = 1/5

    The probability of drawing 9 = 2/5

    Since the sum of the two ticket is greater than or equal to 10,

    If I draw 1 first, I can only only select 9 also = 2/5 * 2/5

    = 4/25

    If I draw 5, I can draw another 5 or 9 later = 1/5 * (1/5+2/5)

    = 1/5 * 3/5

    = 3/25

    If I draw 9 then I can draw anything

    2/5 * 5/5

    = 10/25

    The sum of all the products = 4/25 + 3/25 + 10/25

    = 17/25
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