7.67 Baseball Bats A hardwoods manufacturing plant has several different production lines to make baseball bats of different weights. One such produc- tion line is designed to produce bats weighing 910 grams. During a period of time when the production process was known to be in statistical control, the average bat weight was found to be 900 grams. The observed data were gathered from 50 samples, each consisting of 5 measurements. The standard deviation of all samples was found to be s = 6 grams. Construct an x-chart to monitor the 910-gram bat production process.