• Javascript
• Développement front-end

function calAverage(a) {
  var b = a.length,
      c = 0, i;
  for (i = 0; i < b; i++){
    c += Number(a[i]);
  }
  return c/b;
}

calAverage([5, 1, 1, 1, 5]);
// Output : 2.6