2 0 1 7 , Americans spent a record - high $ 9 . 1 billion Halloween - related purchases ( ℎ balance website ) . Sample data showing the amount, dollars, 1 6 adults spent a Halloween costume are follows: 1 3 3 4 5 2 4 3 6 6 3 6 1 3 3 1 2 6 3 1 1 3 6 6 6 5 4 6 9 6 2 6 . . What the estimate ℎ population mean amount adults spend a Halloween costume ( 2 decimals ). I only have one correct answer so far.