Probability with Javascript & Storyline

These are exactly what triggers me to find a solution. Well here it is :-)


The script that manages works like this. In the input field you offcourse can set you amount of probability... as seen above its set to 78.

In the code on the button there is a function that uses Math.random() to return true or not. If the value from Math.random() is above 0.78 its true..else its false. A count ( x ) is added when true...and when running a loop for 10000000 times you will see that the probability function returns true around the 78%.

var player = GetPlayer();

function probability(n){
return Math.random() < n;
}

var x = 0;
var prob = player.GetVar("NumericEntry")/100;
for(let i = 0; i < 10000000; i++){
if(probability(prob)){
x += 1;
}
}

player.SetVar("testData", x+" of 10000000 given results by Math.random() were under "+prob+" so, a probability of "+x / 100000+" %");

Adding the sample i made.

Kind regards,
Math