It is well known that in evaluating the value of certain probability integral with normaldistribution, 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。
2
The table of standard normaldistribution was handled correctly by use of Raphson numerical integral, by this way, the optimum design was connected with reliability design organically.