Is there a better way for randomization for triggering a percentage of the time

Questions & Answers
1

Hello everyone so currently I am choosing random game objects to trigger think of them like different mini-games. I want them to each have a certain percentage to activate to keep stuff active such as 25,25,20,20,10 and I have written the code below and it does the job but not very well just want to see what others suggest! even if its something as simple as making random.range more random all answers are helpful!!

void SwapMachine()
    {
        if (lastMono != null && lastMono.doneTurn())
        {
            int index = Random.Range(0, 100);
            Debug.Log(index);
            if (index <= 25)
            {
                Right = 0;
                Up = 0;
                Down = 0;
                Slot = 0;

                TriggerMiniGame(gameEvents[0]);
                Left++;       
               // if(Left > 3)
                Reset(Left, 0);


            }
            else if (index > 25 && index <= 50)
            {
                Left = 0;
                Up = 0;
                Down = 0;
                Slot = 0;

                TriggerMiniGame(gameEvents[1]);
                Right++;
               // if(Right > 3)
                Reset(Right, 1);


            }
            else if (index > 50 && index <= 70)
            {
                Left = 0;
                Right = 0;
                Down = 0;
                Slot = 0;

                TriggerMiniGame(gameEvents[2]);
                Up++;
                //if (Up > 3)
                Reset(Up, 2);

            }
            else if (index > 70 && index <= 90)
            {
                Left = 0;
                Right = 0;
                Up = 0;
                Slot = 0;

                TriggerMiniGame(gameEvents[3]);
                Down++;
                //if (Down > 3)
                Reset(Down, 3);

            }
            else if ( index > 90)
            {
                Left = 0;
                Right = 0;
                Up = 0;
                Down = 0;

                TriggerMiniGame(gameEvents[4]);
                Slot++;

              //  if(Slot > 3)
                Reset(Slot, 4);

            }
            else
            {
                Debug.Log("should not trigger, something is wrong");
            }

        }
    }
2

When i do weighted randomization, i like to use to group up the weight and feedback as an object, sum up the weight, and do a randomization in a loop. it’s easier for me to add item or change weight.

class Item{
public float weight;
public System.Action onTrigger;
}

List<Item> list = new List<Item>();
list.Add(new Item(){weight=5,onTrigger=delegrate{
DoThis();
}});
list.Add(new Item(){weight=5,onTrigger=delegrate{
DoThat();
}});

float weightRnd = 0;
foreach(Item item in list){
weightRnd+=item.weight;
}
weightRnd*=Random.value;

foreach(Item item in list){
if(weightRnd<item.weight){
item.onTrigger();
break;
}else{
weightRnd -=item.weight
}
}