Makes chances of something happening C#

Question

How can I make a script that makes one thing happen 4/5 times and the other thing 1/5 times

I need it to appear after this

private void Arrest()
{
    Ped Criminal = Player.GetTargetedPed();
    if (Exists(Criminal) && 
        (Player.Character.Position.DistanceTo(Criminal.Position) <= 10.0F))
    {

Answer 1

static Random rnd = new Random();
static void DoOne() { ... }
static void DoTwo() { ... }
static void RollDice() {
   if (rnd.Next(5) == 0)
       DoOne(); // happens 1/5 times
   else
       DoTwo(); // happens 4/5 times
}

It is important you don't recreate Random instance on each call. You should keep the old instance around and reuse it. Otherwise, the randomly generated sequence will not be uniformly distributed.