ssignment i Saved Help Save & Exit Subr Check my world Problem 10-12 The time needed for checking in at a hotel is to be investigated. Historically, the process has had a standard deviation equal to 146. The means of 39 samples of n =18 are Sample 21 Sample 1 2 3 4 un Mean 3.86 3.90 3.83 3.81 3.84 3.83 3.87 3.88 3.84 3.80 Sample 11 12 13 14 15 16 17 18 19 20 Mean 3.88 3.86 3.88 3.81 3.83 3.86 3.82 3.86 3.84 3.87 NNNNNNN chun NN Mean 3.84 3.82 3.89 3.86 3.88 3.90 3.81 3.86 3.98 3.96 Sample 31 32 33 34 35 36 37 38 39 Mean 3.88 3.76 3.83 3.77 3.86 3.80 3.84 3.79 3.85 an B 9 10 a-1. Construct an -chart for this process with three-sigma limits. (Do not round intermediate calculations. Round your answers to 2 decimal places.) UCL LCL a-2. Is the process in control?