A manufacturer of paper used for packaging requires a minimumstrength of 1400 g/cm^2. To check on the quality of thepaper, a random sample of 10 pieces of paper is selected each hourfrom the previous hour's production and a strength measurement isrecorded for each. The standard deviation σ of thestrength measurements, computed by pooling the sum of squares ofdeviations of many samples, is known to equal 140 g/cm^2, and thestrength measurements are normally distributed.