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Math Help - probability query?

  1. #1
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    probability query?

    Hey everyone..

    just wondering if i could get some assistance with this question..

    The probability of getting a head on a flip of "biased" coin is 0.3.
    If the coin is tossed 50 times, what is the expected probability of getting a head, after 40 throws

    would you do:

    Probability = (0.3 x 40) / 50 ?

    It was a question on a test that i did and want to check i did the right or wrong thing.

    Cheers
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  2. #2
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    Quote Originally Posted by steph_r View Post
    Hey everyone..

    just wondering if i could get some assistance with this question..

    The probability of getting a head on a flip of "biased" coin is 0.3.
    If the coin is tossed 50 times, what is the expected probability of getting a head, after 40 throws

    would you do:

    Probability = (0.3 x 40) / 50 ?

    It was a question on a test that i did and want to check i did the right or wrong thing.

    Cheers
    I'm sorry but I can't make sense of ".. expected probability of getting a head .." Do you mean expected number of heads after 40 throws ....?
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  3. #3
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    probability

    Quote Originally Posted by mr fantastic View Post
    I'm sorry but I can't make sense of ".. expected probability of getting a head .." Do you mean expected number of heads after 40 throws ....?
    yes i think so :S Or perhaps, what is the estimated probability?
    it was a question on a test (assessment task) and i couldnt really remember the question.. sorry for the inconvenience
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  4. #4
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    Quote Originally Posted by steph_r View Post
    yes i think so :S Or perhaps, what is the estimated probability?
    it was a question on a test (assessment task) and i couldnt really remember the question.. sorry for the inconvenience
    The expected number of heads after 40 throws is (40)(0.3).

    Estimating a probability makes no sense since:

    1. You're told the probability of a head each throw is 0.3
    2. There's no information about how many heads have been thrown.

    Wait until you get the test back so you can post the question correctly. By the way, what's stopping you from asking your teacher in the meantime?
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  5. #5
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    Quote Originally Posted by mr fantastic View Post
    The expected number of heads after 40 throws is (40)(0.3).

    Estimating a probability makes no sense since:

    1. You're told the probability of a head each throw is 0.3
    2. There's no information about how many heads have been thrown.

    Wait until you get the test back so you can post the question correctly. By the way, what's stopping you from asking your teacher in the meantime?
    sorry, i was just eager to find out. I guess ill have to wait .
    Thanks anyway
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