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Math Help - Probability Word Problem! #2

  1. #1
    Newbie glue'd'n'math's Avatar
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    Question Probability Word Problem! #2

    I have another probability word problem, please?


    What is the probability that when 3 coins are tossed
    that at least 2 will land tails up?

    Can someone please explain how to get the answer?
    Thank you very much!
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  2. #2
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    mr fantastic's Avatar
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    Quote Originally Posted by glue'd'n'math View Post
    I have another probability word problem, please?


    What is the probability that when 3 coins are tossed
    that at least 2 will land tails up?

    Can someone please explain how to get the answer?
    Thank you very much!
    Write out all the possible combinations of heads and tails (there are 2^3 = 8):

    H H H
    H H T
    H T H
    H T T
    T H H
    T H T
    T T H
    T T T


    How many of these have at least 2 tails ....?

    Pr = (number of favourable outcomes)/(total number of outcomes)
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