Question: It is important that face masks used by firefighters be able to withstand high temperatures because firefighters commonly work in temperatures of 200-500F. In a

It is important that face masks used by firefighters be able to withstand high temperatures because firefighters commonly work in temperatures of 200-500°F. In a test of one type of mask, 11 of 55 masks had lenses pop out at 250°. Construct a 90% upper confidence bound for the true proportion of masks of this type whose lenses would pop out at 250°.

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