A fair coin is flipped 4 times. What is the probability that at least two heads are flipped?

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A fair coin is flipped 4 times. What is the probability that at least two heads are flipped?

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Sarah 2 weeks 2021-09-09T10:04:08+00:00 1 Answer 0

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    2021-09-09T10:05:10+00:00

    60% chance or 3/5 probability

    Here are the different probabilities by flipping the coin 4 times. H=heads T=tails

    HHHH               HHHT                HHTT                  HTTT                     TTTT

    1/5                          1/5                  1/5                     not 1/5                  not 1/5

    If there are 2 or more heads in one of these pairs that pair is 1/5 of the total pairs.

    3/5 probability that there will be 2 or more heads flipped, or 60%

    P.S- it is also a 3/5 chance for 2 or more tails to be flipped also.

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