A control chart for thickness of rolled-steel sheets is based on an upper control limit of .0520 in. and a lower limit of .0475 in. The first ten values of the quality statistic (in this case X

, the sample mean thickness of n
5 sample sheets) are .0506,

.0493, .0502, .0501, .0512, .0498, .0485, .0500, .0505, and

.0483. Construct the initial part of the quality control chart, and comment on its appearance.