Assuming it is iQ for example,i would guess that +4 sigma would mean 4*15=60 above the mean,which if you take as 100 gives 160.I would welcome a better clarifi

Assuming it is iQ for example,i would guess that +4 sigma would mean 4*15=60 above the mean,which if you take as 100 gives 160.I would welcome a better clarification of this.