a$)$ Standard deviation of the sampling means$=$

$$

$0\mathrm{.}608$ ounces $($round your response to three decimal$$ places$).$

Part $3$

$$b$)$ With z$=3,$ the control limits for the mean chart$$ are:

UCL Subscript x overbar $=$

$$

enter your response here ounces $($round your response to three decimal$$ places$).$