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Math Help - standard normal formula

  1. #1
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    standard normal formula

    Hi;
    I know the formula is Z = (X - mean)/standard deviation,What I don't know
    is how do I know when I convert a normal distribution into z
    which is written as X ~ N(mean,variance or standard deviation).

    How do I know if X ~ N(50,4) the number 4 is variance or standard deviation
    because when I put it back into the Z formula it has to be divided by standard deviation?

    Thanks.
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  2. #2
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    Re: standard normal formula

    I thought it was always written as X ~ N( Mean , Standard Deviation )...
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  3. #3
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    Re: standard normal formula

    The notation people use varies so you'll have to check elsewhere in their work for the system they are using.
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  4. #4
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    Re: standard normal formula

    In other words, "read your textbook"!
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  5. #5
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    Re: standard normal formula

    Ok thanks.
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