The following are a few of generally accepted values:

% of Population Number of Standard Deviations away from Mean
50.0% 0.674
68.3% 1.000
90.0% 1.645
95.0% 1.960
95.4% 2.000
99.7% 3.000


Given the % of Population, is there an Excel formula that can be used
to determine the number of Standard Deviations away from the Mean?
Thus, entering 90% in A1, the formula in B1 would result in 1.645 as
shown above.

I'd be using this to expand the table above to include additional
percentages (e.g., 75%, 85%, or whatever number I needed at the time).

Many thanks.