### 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

 A 1 =NORMINV(99%,0,1) = 2.326 2 =NORMINV(50%,0,1) = 0.0 3 =NORMINV(25%,0,1) = -0.674 4 =NORMINV(5%,0,1) = -1.645 5 =NORMINV(0.908789,40,1.5) = 42 6 =NORMINV(0.87,0,1) = 1.126 7 =NORMINV(NORMDIST(0.87,0,1,TRUE),0,1) = 0.87 8 =NORMINV(100%,0,1) = #NUM! 9 =NORMINV(1,0,1) = #NUM! 10 =NORMINV(-1,40,1.5) = #NUM! 11 =NORMINV(2,40,1.5) = #NUM! 12 =NORMINV(0.908789,"some text",1.5) = #VALUE!