Question: 
Write a function to find sum and average of first n natural numbers.


Model's Code:
def sum_average(n):
    total_sum = n * (n + 1) // 2
    average = total_sum / n
    return total_sum, average



Sample Correct Code:
def sum_average(number):
 total = 0
 for value in range(1, number + 1):
    total = total + value
 average = total / number
 return (total,average)


Asserts:
assert sum_average(10)==(55, 5.5)
assert sum_average(15)==(120, 8.0)
assert sum_average(20)==(210, 10.5)


Tests:
Test 1 of 3: PASS
Test 2 of 3: PASS
Test 3 of 3: PASS

Test 599 of 974: 446/599 (74.45742904841403%): success