Autopitch devices are made for both major- and minor-league teams to them improve their batting averages. when set at the standard position, autopitch can throw hardballs toward a batter at an average speed of 60 mph. to monitor these devices and to maintain the highest quality, autopitch executives take samples of 10 devices at a time. the average range is 3 mph. using this information, construct control limits for x overbar x and r charts. for the given sample size, the control limits for the 3-sigma x overbar x chart are: ucl subscript x overbar uclx equals = nothing units (round your response to three decimal places). lcl subscript x overbar lclx equals = nothing units (round your response to three decimal places). the control limits for the 3-sigma r-chart are: ucl subscript upper r uclr equals = nothing units (round your response to three decimal places).