# Q2
mark = []

while True:
    m = float(input("Enter quiz mark: "))
    if m < 0.0:
        break
    else:
        mark.append(m)

sum = 0.0
for i in mark:
    sum += i
    mean = sum / len(mark)
print("Mean = ", mean)

var = 0.0
for i in mark:
    var += (i - mean) ** 2
var = var / len(mark)
print(f"Variance = {var}")