Management at Deluxe Diner is in process of establishing a quality control system for the time it takes to initially make contact with a table of patrons. A sample of size 3 is taken on each of the five different days. Suppose you calculated LaTeX: \bar{\bar{x}} = 100 and LaTeX: \bar{R} = 40. What is the 3-sigma UCL for the X-bar chart? Management at Deluxe Diner is in process of establishing a quality control system for the time it takes to initially make contact with a table of patrons. A sample of size 3 is taken on each of the five different days. Suppose you calculated LaTeX: \bar{\bar{x}} = 100 and LaTeX: \bar{R} = 40. What is the 3-sigma UCL for the X-bar chart? Less than 120 Greater than or equal to 120 but less than 130 Greater than or equal to 130 but less than 140 Greater than or equal to 140 but less than 150 Greater than or equal to 150 but less than 160 Greater than or equal to 160