A manufacturer of college textbooks is interested in estimating the strength of the bindings…

A manufacturer of college textbooks is interested in
estimating the strength of the bindings produced by a particular binding
machine. Strength can be measured by recording the force required to pull the
pages from the binding. If this force is measured in pounds, how many books
should be tested to estimate with 95% confidence to within 0.1 lb, the average
force required to break the binding? Assume that s is known to be 0.8 lb.

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