gradesAvrage

  let { course , minPassingGrade, students } = data;

  let passedStudents = [];
  let avrage = 0;

  students.forEach(el => {

    let gradesAvrage = 0;
      el.grades.forEach(element => {
          gradesAvrage += element;
      });

      gradesAvrage = Number((gradesAvrage / el.grades.length).toFixed(1));

      if (gradesAvrage >= minPassingGrade) {
        passedStudents.push({name: el.name, score: gradesAvrage});
        avrage += gradesAvrage;
      }

      gradesAvrage = 0;
  });

  if (avrage !== 0 && passedStudents.length !== 0) {
    avrage /= passedStudents.length;
  }

  let obj = {course, minPassingGrade, courseAverage: avrage, passedStudents}

  return obj;