It is important that face masks used by firefighters be able

It is important that face masks used by firefighters be able to withstand high temperatures because firefighters commonly work in temperatures of 200-500 degree F. In a test of one type of mask, 9 of 45 masks had lenses pop out at 250 degree. Construct a 90% upper confidence limit for the true proportion of masks of this type whose lenses would pop out at 250 degree. (Round your answer to four decimal places.) ( , ) You may need to use the appropriate table in the Appendix of Tables to answer this question. Manufacturer of college textbooks is interested in estimating the strength of the bindings placed by a particular binding machine. Strength can be measured by recording the force to pull the pages from the binding. If this force is measured in pounds, how many be tested to estimate the average force required to break the binding to within 0.2 confidence? Assume that sigma is known to be 0.7. (Round your answer up to the nearest.)

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