I'm stuck and don't know what's wrong!

Could you guys take a look at it and tell me what to fix?

**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]****}**

**def average(numbers):****total=sum(numbers)****total=float(total)****total=total/len(numbers)****return total**

**def get_average(student):****homework = average(student["homework"])****quizzes = average(student["quizzes"])****tests = average(student["tests"])****return 0.1 * homework + 0.3 * quizzes + 0.6 * tests**

**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"**

**print get_letter_grade(get_average(lloyd))**

**def get_class_average(students):****esults = []****for student in students:****get_average(student)****results.append(get_average(student))****return average(results)**

**print get_class_average(students)****print get_letter_grade**

Thanks!