new_contents: lloyd = {
      "name": "Lloyd",
      "homework": [90.0, 97.0, 75.0, 92.0],
      "quizzes": [88.0, 40.0, 94.0],
      "tests": [75.0, 90.0]
  }
  alice = {
      "name": "Alice",
      "homework": [100.0, 92.0, 98.0, 100.0],
      "quizzes": [82.0, 83.0, 91.0],
      "tests": [89.0, 97.0]
  }
  tyler = {
      "name": "Tyler",
      "homework": [0.0, 87.0, 75.0, 22.0],
      "quizzes": [0.0, 75.0, 78.0],
      "tests": [100.0, 100.0]
  }
  students = [lloyd, alice, tyler]
  # Add your functions below!
  def average(numbers):
      total = sum(numbers)
      total = float(total)
      average = total / len(numbers)
      return average
      
      
  def get_average(student):
      homework = average(student["homework"])
      quizzes = average(student["quizzes"])
      tests = average(student["tests"])
      return (homework * 0.1) + (quizzes * 0.3) + (tests * 0.6)
      
      
  def get_letter_grade(score):
      if score >= 90:
          return "A"
      elif score >= 80:
          return "B"
      elif score >= 70:
          return "C"
      elif score >= 60:
          return "D"
      else:
          return "F"
          
          
  def get_class_average(students):
      results = []
      for student in students:
          results.append(get_average(student))
      return average(results)
      
  
  print get_class_average(students)
  
  print get_letter_grade(get_class_average(students))
  
subject: Create class-managment.py