58. There is no nice formula for the standard normal cdf (z), but several good approximations have...

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58. There is no nice formula for the standard normal cdf (z), but several good approximations have been published in articles. The following is from “Approximations for Hand Calculators Using Small Integer Coefficients” (Mathematics of Computation, 1977: 214–222). For 0  z  5.5,

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