What is NORM.S.INV function in Excel? NORM.S.INV function is one of Statistical functions in Microsoft Excel that returns the inverse of the standard normal cumulative distribution. The distribution has a mean of zero and a standard deviation of one. Syntax of NORM.S.INV function NORM.S.INV(probability) The NORM.S.INV function syntax has the following arguments: Probability: A probability corresponding to the normal distribution. NORM.S.INV…