gistfile1.txt

public class WeightedSettings{
  public string key;
	public float weight;
  public float reward;
}

	public static string WeightedRandom(this List<WeightedSettings> list){
		var totalChance = 0f;
		foreach(var o in list){
			totalChance += o.weight;
		}
		var seed = UnityEngine.Random.Range(0f, totalChance);
		foreach(var o in list){
			seed -= o.weight;
			if(seed<=0f){
				return o.key;
			}
		}
		return null;
	}

	public static List<string> WeightedRandomSet(this List<WeightedSettings> list, int min, int max){
		var randomSet = new List<string>();
		int setLength = UnityEngine.Random.Range(min, max);
		for(int i = 0; i<setLength; i++){
			randomSet.Add(list.WeightedRandom());
		}
		return randomSet;
	}