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Statistics LibreTexts

5: Normal Probability Distribution

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  • Normal Probability Distribution

    This calculator computes P(a < x < b), where x is a normal random variable, and a and b are the lower bound and upper bound for x.  Please report the error to Dr. Jessica Kuang at

    To learn how to use this calculator, please watch a short video here.


    Mean: Standard Deviation:



    Enter 2 out of 3 values below to either calculate the probability or a boundary value
    (enter integers or decimals only)

    Lower Bound:   Upper Bound:   Probability:  

    Error Message:


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