public static decimal GetAverageGoalForCompetition(int competitionId)
{
using (var db = new sakilaEntities4())
{
var matches = MainCalculator.GetAllMatchesForCompetition(competitionId, db);
var sumHomeGoals = matches.Sum(x => x.HomeGoals);
var sumAwayGoals = matches.Sum(x => x.AwayGoals);
return((decimal)(sumAwayGoals + sumHomeGoals) / matches.Count);
}
}