Table 14-1 lists process data consisting of the weights (g) of quarters, and the United States Mint

Question:

Table 14-1 lists process data consisting of the weights (g) of quarters, and the United States Mint uses a manufacturing process designed to result in a mean weight equal to 5.670 g. If recent x and R control charts show that the process of manufacturing quarters is within statistical control, does that indicate that the quarters have weights that are reasonably close to 5.670 g? Why or why not?