# Write a function that takes a list of grades
# Each item (in the list of grades) contains grades for each course
# the student took.
# The function returns a list of averages of the courses.
# Example:
#    list_of_grades = [[80, 90], [90, 89, 97], [75, 90, 100], [70, 75, 90, 85]]
# the function returns averages = [85.0, 92.0, 83.33, 80.0]

def compute_averages(lst):
    """
    The function takes a list of grades and
    returns a new list in which each item is
    the average of the grades for each course
    """

    list_avg = []

    for course_grade in lst:
        total = 0
        for grade in course_grade:
            total += grade
        avg = total / len(course_grade)
        list_avg.append(avg)

    return list_avg






list_of_grades = [[80, 90], [90, 89, 97], [75, 90, 100], [70, 75, 90, 85]]
print(compute_averages(list_of_grades))