Refer to (3 sigma) for this problem Thirty-five samples of size 7 each were taken from a fertlizer-b

Refer to (3 sigma) for this problem Thirty-five samples of size 7 each were taken from a fertlizer-bag-tllig machine. The results were: Overall mean 57.75 Ib;: Average range R 1.54 b. a) For the given sample size, the control limits for 3-sigma x chart are: Upper Control Limit (UCL»-in (round your response to three dec mal places).