NORMINV(probability, mean, standard_dev) 
Returns the x variable corresponding to less than a particular probability. 
probability  The probability associated with the distribution. 
mean  The arithmetic mean of the distribution. 
standard_dev  The standard deviation of the distribution. 
Remarks 
* NORM.INV was added in Excel 2010 to replace this function. * The normal distribution is a continuous distribution. * If "probability" < 0, then #NUM! is returned. * If "probability" > 1, then #NUM! is returned. * If "probability" is not numeric, then #VALUE! is returned. * If "mean" is not numeric, then #VALUE! is returned. * If "standard_dev" = 0, then #NUM! is returned. * If "standard_dev" is not numeric, then #VALUE! is returned. * This function uses an iterative technique for calculating the function. * Given a "probability" value, this function iterates until the result is accurate to within ±3x10^7. * If this function does not converge after 100 iterations, then #N/A is returned. * In Excel 2010 the accuracy of this function was improved. * For the Microsoft documentation refer to support.office.com 

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