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It is important that face masks used by firefighters be able to withstand high temperatures because...

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 limit for the true proportion of masks of this type whose lenses would pop out at 250°. (Round your answers to four decimal places.)

(0.1113, 0.2887) is incorrect. I need help figuring out why.

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