x and S control charts are maintained for a certain quality characteristic. The sample size is twelve. After 50 samples, we have x=9810 and s=1350. What is the lower control limit for the x chart (i.e., x-bar chart)? [Select the appropriate range in which your answer falls.] Less than or equal to 210 More than 210 but less than or equal to 230 More than 230 but less than or equal to 240 More than 240 but less than or equal to 260