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Math Help - coin help

  1. #1
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    coin help

    a fair coin is tossed until a head is obtained
    a) find the expected value of the number of tosses required.
    b) what is the expected value of the number of heads tossed.


    i think part a is E(X)= 1/P = 1/0.5 = 2
    ANY HELP WITH THIS WOULD BE GREAT THANKS
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  2. #2
    Member Henderson's Avatar
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    Unless you've made a typo, the answer to part b) is a simple one:

    You're flipping a coin until you get a head, then you stop?
    Every time you do this experiment, you'll get exactly one head. The answer is one.
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