Final answer:
Dividing the annual cost of insurance and pensions by 12 would yield the average monthly expenditure for an American, which is one-twelfth of the annual amount.
Step-by-step explanation:
If Noelle suggests dividing the insurance and pensions cost by 12 to determine the average monthly expenditure for an American, the result would be the average monthly expenditure. Therefore, by dividing the annual cost of insurance and pensions by 12, the outcome would be one-twelfth of the original amount, not the same, 12 times less, or 12 times more. This calculation is a common method to break down annual figures into monthly amounts to better understand and manage monthly budgets.