https://support.microsoft.com/en-au/office/norm-inv-function-54b30935-fee7-493c-bedb-2278a9db7e13
=NORM.INV(95%,20,3)
20 = mean
3 = SD
returns value so that 95% of other values are less
NORM.INV function – Microsoft Support
September 3, 2023NORM.S.DIST function – Microsoft Support
September 3, 2023https://support.microsoft.com/en-au/office/norm-s-dist-function-1e787282-3832-4520-a9ae-bd2a8d99ba88
