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Math Help - Toses of a fair coin

  1. #1
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    Toses of a fair coin

    How many tosses of a fair coin are needed so that the probability of getting atleast one head is 0.875 ?
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  2. #2
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    Quote Originally Posted by Stats View Post
    How many tosses of a fair coin are needed so that the probability of getting atleast one head is 0.875 ?
    Similar to your other question:

    1 - (Probability not getting any heads) = 0.875
    So, you want the probability of not getting any heads to equal 0.125.

    For one toss, the probability of not getting a head = 0.5.
    For two tosses the probability of not getting a head = 0.5 * 0.5 = 0.25

    etc.
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