The weights of the oranges from Arnie's Orange Grove are normally distributed with a mean of 8.8 ounces and a standard deviation of 1.1 ounces. The oranges are sold in boxes of twelve oranges each, and each box may be considered a random sample. What total weight separates the lightest 40 percent of all the boxes of Arnie's oranges from the rest? Round your answer to the nearest tenth of an ounce.