#Q2
quiz_marks = []
total = 0

mark = float(input("Enter a quiz mark (negative number to stop): "))
while mark >= 0:
    quiz_marks.append(mark)
    total += mark
    mark = float(input("Enter a quiz mark (negative number to stop): "))

n = len(quiz_marks)
mean = total / n
variance = 0
for mark in quiz_marks:
    variance += (mark - mean) ** 2
variance /= n

print("Mean:", mean)
print("Variance:", variance)