It is well known that in evaluating the value of certain probability integral with normal distribution, there are three kinds of table usually employed.
众所周知，在计算正态分布的概率积分值时，有三种表可供查阅。
Coordinates of a normal probability paper are calculated with a approximate formula of normal distribution integral curve and drawn on screen.
采用正态分布积分曲线的近似公式计算概率格纸的坐标，并在屏幕绘图。
From a probability basic equation through mathematical deduction, a probability integral equation is set up in constraint condition of non-normal distribution.
从概率基本公式出发，在偏态分布的约束条件下，经数学推导；建立概率积分式。
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