It is important that face masks used by firefighters beable to withstand high
Chapter 7, Problem 54(choose chapter or problem)
It is important that face masks used by firefighters beable to withstand high temperatures because firefighterscommonly work in temperatures of 200500F. In a testof one type of mask, 11 of 55 masks had lenses pop outat 250. Construct a 90% upper confidence bound for thetrue proportion of masks of this type whose lenses wouldpop out at 250.
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