53.610 is not the answer I got it wrong.

Refer to Table S6.1 - 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 =54.75lb.; Average range R=1.54lb. a) For the given sample size, the control limits for 3 -sigma x chart are: Upper Control Limit (UCLx)= lb. (round your response to three decimal places). Lower Control Limit (LCL)= Ib. (round your response to three decimal places)