IV-range for wild PKM is 0-15 each, making a gauss-alike-distribution for Sum-IV with a low propability of extreme good or extreme bad IVs.
IV-range for Egg-PKM is 10-15 each, therefore sum-IV is alwais over 66%, with higher propabilitys of IV > 80%, 85%, 90%, whatever. Only problem: Hatched PKM are never above level 20.
https://pokemongo.gamepress.gg/egg-iv-distribution
So it is quite expectable, that hatched PKM tend to be very good, and daily question "what is better - push lvl-20-PKM with High IV or level-27-PKM with low IV????" is boring, but reasonable.