how do i get these answers?

Refer to Table 56.1 - Factors for Computing Control Chart Limits ( 3 sigma) for this problem. Thirty-five samples of size 7 each were taken from a fertilizer-bag-filling machine at Panos Kouvelis Lifelong Lawn Ltd. The results were: Overall mean =60.75lb.; Average range R=1.78lb. a) For the given sample size, the control limits for 3-sigma x chart are: Upper Control Limit (UCL)= lb. (round your response to three decimal places). Lower Control Limit (LCL)= lb. (round your response to three decimal places). b) The control limits for the 3 -sigma R-chart are: Upper Control Limit (UCLR)= lb. (round your response to three decimal places). Lower Control Limit (LCLR)=0.135lb. (round your response to three decimal places)