In three tosses of a fair coin, what is the probability of getting at least 2 heads? (A fair coin is equally likely to come up heads or tails.)

Is the answer 3/8, 5/8, 7/8, or 1/2? how do you go about solving this? (I came up with 3/8).

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- Aug 31st 2011, 06:07 PMbenny92000Three tosses of a fair coin
In three tosses of a fair coin, what is the probability of getting at least 2 heads? (A fair coin is equally likely to come up heads or tails.)

Is the answer 3/8, 5/8, 7/8, or 1/2? how do you go about solving this? (I came up with 3/8). - Aug 31st 2011, 06:22 PMpickslidesRe: Three tosses of a fair coin
I would pick 1/2, 'at least 2' means the p(2)+p(3)

Draw a tree diagram you will see.