//Opción 1:
function findAverage(array) {
  if(array.length === 0) {
    return(0);
  }
  return array.reduce((a, b) => a + b, 0) / array.length;
} 

//Opción 2:
var find_average = (array) => {  
  return array.length === 0 ? 0 : array.reduce((a, b)=> a + b, 0)/array.length
}