How much stronger is an average man than an average woman?

 The average woman has 52% of the upper body strength and 66% of the lower body strength of the average man. Overall, the average woman is stronger than 2.5% of men, and the average man is stronger than 97.5% of women.

Here’s an example in grip strength, which is easy to measure:

(Evolution, Medicine, and Public Health [2016] pp. 117–132 doi:10.1093/emph/eow00)

And the situation doesn’t get much more “equal” when it comes to comparing female elite athletes with all men:

Physical strength differential is a point that conclusively attests to the fact that men and women are different.