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Thread: URGENT! Need help with probability question

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    URGENT! Need help with probability question

    Thank god if someone replies as HSC math is within a few hours

    -If 3% of coins produced are faulty, what is the probability that a sample of 3 coins taken from the production line will have atleast two faulty coins

    I keep getting the quesiton wrong

    Ans = 1323/500000 (I think thats the right ans)

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    Rambling Spirit
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    Re: URGENT! Need help with probability question

    Quote Originally Posted by Danneo View Post
    Thank god if someone replies as HSC math is within a few hours

    -If 3% of coins produced are faulty, what is the probability that a sample of 3 coins taken from the production line will have atleast two faulty coins

    I keep getting the quesiton wrong

    Ans = 1323/500000 (I think thats the right ans)








    –––––––––



    Last edited by InteGrand; 25 Oct 2018 at 12:32 PM.

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    Member HeroWise's Avatar
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    Re: URGENT! Need help with probability question

    Imagine this comes in the HSC

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    Re: URGENT! Need help with probability question

    Holy crap, this just changed how i see binomial, so just tested 1 - (P(No faults) + (1 fault))
    P(No faults) = (97/100)^3
    P(Exactly 1 fault) = 3C1*(3/100)*(97/100)^2
    and it worked, thank you good sir

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