student_grades = [9.1,8.8,7.5]

mysum = sum(student_grades)
length = len(student_grades)
mean = mysum / length
print(length)

max_value = max(student_grades)
print(max_value)

student_grades = [9.1, 8.8, 10.0, 7.7, 6.8, 8.0, 10.0, 8.1, 10.0, 9.9]
print(student_grades.count(10.0))

username = "Python3"   
print(username.lower())

student_grades = {"Mary": 9.1, "Sim": 8.8, "John": 7.5}
print(student_grades.values())
