TypeError:'tuple' object is not callable

def grade(total):
    result = total % len(grade)
    return result
def total(*grade):
    total = 0
    grade=list(*grade)
    for i in grade:
        total += i
    return total
grade=(4,5,4,3,3,5) 
total(grade)
grade(total)
print(result)

Выдает ошибку TypeError:'tuple' object is not callable в 12 строке