Solution - Task 12: Valid marks only

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One possible program:

total = 0.0
count = 0

while True:
    mark = float(input("Enter mark (-5 to finish): "))
    if mark == -5:
        break
    if 50 <= mark <= 100:
        count += 1
        total += mark

if count > 0:
    print("Average of valid marks:", total / count)
else:
    print("No valid marks entered.")