Solution - Task 4: Marks in a list

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One possible program:

marks = []

while True:
    mark = float(input("Mark (-1 to finish): "))
    if mark == -1:
        break
    marks.append(mark)

if len(marks) == 0:
    print("No marks entered.")
else:
    print("Count:", len(marks))
    print("Average:", sum(marks) / len(marks))