simulation.js

function round(bool) {
  let answer = false;
  if (Math.random() > 0.3) answer = true;
  if (bool == answer) return 1;
  return -1;
}

let result;

result = 0;
for (let i =0; i<10000; i++) {
  result += round(true);
}
console.log(`always true: ${result}`);

result = 0;
for (let i =0; i<10000; i++) {
  result += round(false);
}
console.log(`always false: ${result}`);


result = 0;
for (let i =0; i<10000; i++) {
  let bool = false
  if (Math.random() > 0.3) bool = true;
  result += round(bool);
}
console.log(`70% true, 30% false: ${result}`);