```
>>> with open('student-becomes-teacher.py','r') as f:
print (f.read())
'''
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 function below!
def average(numbers):
total = sum(numbers)
return float(total)/len(numbers)
def get_average(student):
homework = 0.1 * average(student["homework"])
quizzes = 0.3 * average(student["quizzes"])
tests = 0.6 * average(student["tests"])
return homework + quizzes + tests
def get_class_average(students):
results = []
for student in students:
results.append(get_average(student))
return average(results)
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)))
print (get_class_average(students))
'''
```

```
>>> with open('student-becomes-teacher.py','r') as f:
letter_frequency(f.read())
e 101 17.353952
t 64 10.996564
r 54 9.278351
s 52 8.934708
u 33 5.670103
a 33 5.670103
n 31 5.326460
l 29 4.982818
o 28 4.810997
d 23 3.951890
g 19 3.264605
i 17 2.920962
m 13 2.233677
z 12 2.061856
c 11 1.890034
f 11 1.890034
v 10 1.718213
y 8 1.374570
w 7 1.202749
h 6 1.030928
q 6 1.030928
k 6 1.030928
b 4 0.687285
p 4 0.687285
j 0 0.000000
x 0 0.000000
>>>
```