=+82. It is important that face masks used by firefighters be able to withstand high temperatures. In a test of one type of mask, the lenses in 11 of the 35 masks popped out at a temperature of 250°F. Calculate a lower confidence bound for the proportion of all such masks whose lenses would pop out at this temperature using both the method suggested in Section 7.3 and the method suggested in Exercise 26(b).