Ben operates a concession stand serving Iced Tea at the Washington County Fair. Ben is the only employee stationed at his stand. Also, suppose that the following information holds good. • The mean service time is six minutes. • Control limits are 3 standard deviations on either side of the mean service time. • The standard deviation is 0.5 min. • Lower and Upper specification limits for a service time are 5.0 minutes and 7.0 minutes, respectively. Based on the above information, we can best infer that: a. Ben needs to change the lower spec. limit to 4.5 minutes and the upper spec. limit to 7.5 minutes. O b. Ben always serves iced tea within the time limit expectations of any customer. O c. Ben's service process is NOT a capable one. O d. Ben's service process is a capable one. e. b and d are true.
