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Math Help - Normal distribution question

  1. #1
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    Normal distribution question

    I've got a question here the importants parts of it
    regulations say bacteria, per litre of seawater, must be less than 4
    rate of occurance of this bacteria at a beach, is 4.6 per litre of sea water
    it asks me to say what probabilty distribution to use, i'm sure its the normal distribution
    use the distribution to find the prob that this beach will fail the regulations

    how am i supposed to do this becasue all the example i have to use the normal distribution involve the mean and sd.

    Please could someone explain or solve this for me
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  2. #2
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    Quote Originally Posted by smidga View Post
    I've got a question here the importants parts of it
    regulations say bacteria, per litre of seawater, must be less than 4
    rate of occurance of this bacteria at a beach, is 4.6 per litre of sea water
    it asks me to say what probabilty distribution to use, i'm sure its the normal distribution
    use the distribution to find the prob that this beach will fail the regulations

    how am i supposed to do this becasue all the example i have to use the normal distribution involve the mean and sd.

    Please could someone explain or solve this for me
    4.6 cells in an entire litre of seawater? 4.6 million cells? How many litres were tested? We need more detail.

    Try posting the original question, word-for-word.
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  3. #3
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    Quote Originally Posted by smidga View Post
    I've got a question here the importants parts of it
    regulations say bacteria, per litre of seawater, must be less than 4
    rate of occurance of this bacteria at a beach, is 4.6 per litre of sea water
    it asks me to say what probabilty distribution to use, i'm sure its the normal distribution
    use the distribution to find the prob that this beach will fail the regulations

    how am i supposed to do this becasue all the example i have to use the normal distribution involve the mean and sd.

    Please could someone explain or solve this for me
    The Poisson distribution may be appropriate here.
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