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Thread: Lactose intolerance causes difficulty.... (probability math problem) STUCK!!

  1. #1
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    Lactose intolerance causes difficulty.... (probability math problem) STUCK!!

    Ok here is my issue I am trying to complete my homework however I am stuck on a simple stupid probability question. I have attached my problem, I have figured out the top portion as it was quite simple but the second part to the question I am stuck on. The problem I screen shotted is a "practice problem" as I only have a specific number of attempts at the actual problem so in order to understand the concept I opted for the practice problem first.

    SCREEN SHOT is attached....

    I got part one by taking the 82% of Whites & calculated what 15% of 82% was which I got 12.3 i dont need to explain the rest you get the gist hopefully

    Lactose intolerance causes difficulty.... (probability math problem) STUCK!!-screen-shot-2017-03-13-10.31.25-pm.png

    In your post please explain how you got the answer so i can replicate it or teach myself how you went about getting the answer
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    Re: Lactose intolerance causes difficulty.... (probability math problem) STUCK!!

    we have

    $(.82)(.15)+(.14)(.7)+(.04)(.9) = 0.257$ of the population is intolerant as you found.

    $(0.04)(.9) = 0.036$ of the population are Asians that are intolerant

    $\dfrac{0.036}{0.257} = 0.14 = 14\%$ of the lactose intolerant population are Asians.
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    Re: Lactose intolerance causes difficulty.... (probability math problem) STUCK!!

    ok well for some reason i tried the same arithmetic on the the actual assignment and it's saying I got it wrong, why could this be ?

    photo attached
    Lactose intolerance causes difficulty.... (probability math problem) STUCK!!-screen-shot-2017-03-13-11.34.51-pm.png



    PS. when i entered 14% in the practice problem, it said it was wrong... so i went ahead & asked it to show me the answer it was 14.1% WTH !!
    Last edited by jdurb1550; Mar 13th 2017 at 10:39 PM.
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    Re: Lactose intolerance causes difficulty.... (probability math problem) STUCK!!

    Quote Originally Posted by jdurb1550 View Post
    ok well for some reason i tried the same arithmetic on the the actual assignment and it's saying I got it wrong, why could this be ?

    photo attached
    Click image for larger version. 

Name:	Screen Shot 2017-03-13 at 11.34.51 PM.png 
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    PS. when i entered 14% in the practice problem, it said it was wrong... so i went ahead & asked it to show me the answer it was 14.1% WTH !!

    it's not 0.11%

    it's 11.1 %
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    Re: Lactose intolerance causes difficulty.... (probability math problem) STUCK!!

    0.036 / 0.257 = 0.1400778... which rounds to 14.01% not 14.1%. Did they ask for answer correct to 2 dec places?
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    Unhappy Re: Lactose intolerance causes difficulty.... (probability math problem) STUCK!!

    Quote Originally Posted by romsek View Post
    it's not 0.11%

    it's 11.1 %
    tried 11.1... still wrong only have 4 submission attempts to this problem before I am unable to submit anymore answers thus far have 3 wrong attempts however the first part of the question correct
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    Re: Lactose intolerance causes difficulty.... (probability math problem) STUCK!!

    Quote Originally Posted by jdurb1550 View Post
    tried 11.1... still wrong only have 4 submission attempts to this problem before I am unable to submit anymore answers thus far have 3 wrong attempts however the first part of the question correct
    well I don't know what to tell you. It sounds like your test software came from Betsy DeVos.
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