A production process is checked periodically by a quality control inspector. The inspector selects simple random samples of 30 finished products and computes the sample mean product weight x. If test results over a long period of time show that 5% of the x values are over 2.1 pounds and 5% are under 1.9 pounds. Use z-table. a. What is the population mean for the population of products produced with this process? b. What is the population standard deviation for the population of products produced with this process? (to 2 decimals) TABLE 1 CUMULATIVE PROBABILITIES FOR THE STANDARD NORMAL DISTRIBUTION (Continued) Entries in the table give the area under the curve to the left of the z value. For example, for z=1.25, the cumulative probability is .8944