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    grtfvxcv cxfhg's Avatar
    grtfvxcv cxfhg Posts: 1, Reputation: 1
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    #1

    Mar 17, 2013, 11:18 AM
    If three fair coins are tossed, find the probabilities of each number of heads.
    a. Fewer than 3

    This is the only question i am stuck on. Please help!
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Mar 18, 2013, 06:11 AM
    Two ways to approach this. The hard way is to add together P(0 heads) + P(1 head) + P(2 heads). The easy way is to realize that P(less than 3 heads) = 1-P(3 heads); so if you can figure out P(3 heads) you can easily find P(less than 3 heads).
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