How to find out the average perk level of all players in the game

function bool TeamIsStrong()
{
    local Controller C;
    local int levelSum;
    local int N;
    for( C = Level.ControllerList; C != None; C = C.nextController )
    {
        if( C.IsA('PlayerController') && C.Pawn!=None && C.PlayerReplicationInfo.PlayerID>0 && C.Pawn.Health>0)
        {
            levelSum+=KFPlayerReplicationInfo(C.PlayerReplicationInfo).ClientVeteranSkillLevel;
            N++;
        }
    }
    if(levelSum/N>=11) return true;
    return false;
}

If on the client, then it’s much better to use

var() array<PlayerReplicationInfo> PRIArray;

from GameReplicationInfo

If this is some kind of GUI element, then you can do this

local GameReplicationInfo GRI;
local PlayerReplicationInfo PRI;
GRI = PlayerController(PlayerOwner()).GameReplicationInfo;
for ( i = 0; i < GRI.PRIArray.Length; i++)
{
    PRI = GRI.PRIArray[i];
    ...
}

If this is SRScoreBoard, then there is already a GRI there (obtained from the great-great-grandparent of ScoreBoard from Engine) If not GUI, then the local controller can be obtained from here: Level.GetLocalPlayerController()