public double AverageScoreForTipstersWhoTipped(GrandPrix grandPrix)
{
var tips = from tipster in Tipsters
from tip in tipster.Tips
where tip.Key == grandPrix && tip.Value != null
select grandPrix.ScoreForTip(tip.Value);
return(tips.Count() > 0 ? tips.Average() : 0);
}
public Int32 ScoreTip(GrandPrix race)
{
return(race.ScoreForTip(this));
}