# Iterate over the list
for student in students:
    name = student[0] # Access names
    grades = student[1] # Access grades
    average_grade = sum(grades) / len(grades) # Calculate mean grades
    print(f"{name}'s average grade is {average_grade:.2f}")

>>>

    John's average grade is 86.25
    Emily's average grade is 82.50
    Michael's average grade is 91.00
    Sophia's average grade is 88.50