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Math Help - Binomial Distribution

  1. #1
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    Binomial Distribution

    Hi guys

    ive got my as exam coming up and im trying to revise binomial distribution

    my problem is i dont have a clue lol

    ive been going through the textbook and one of the questions is

    the question im on is this

    A woman is trying to light a bonfire. She only has 4 matches left in her box

    given that 10% of matches break

    what is the probability that
    (A) all 4 matches brake
    (B) at least 1 match doesnt break

    i worked out a to be 0.0001 but how the heck do i do b?
    cheers
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  2. #2
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    Quote Originally Posted by scottyc View Post
    Hi guys

    ive got my as exam coming up and im trying to revise binomial distribution

    my problem is i dont have a clue lol

    ive been going through the textbook and one of the questions is

    the question im on is this

    A woman is trying to light a bonfire. She only has 4 matches left in her box

    given that 10% of matches break

    what is the probability that
    (A) all 4 matches brake
    (B) at least 1 match doesnt break

    i worked out a to be 0.0001 but how the heck do i do b?
    cheers
    Pr(at least 1) = 1 - Pr(none).
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