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formula for z-score vs percentile

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  • formula for z-score vs percentile

    Dear BIOMCH readers,

    While programming some evaluation sofware I came up with a problem
    concerning the use of a cumulative probabilities table.

    This is the problem:

    To determine the percentile of a normal distribution you have to use a
    specific table, the cumulative probabilities table. When plotting this
    table as a graph you get a specific curve. The problem is that I cannot
    find the formula for this curve (Using such formula makes programming a
    lot easier).
    I found the cumulative probability function for a continuous uniform
    random variable:

    y=(x-a)/(b-a) where a
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