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 = 20 are 3.82 Sample Mean Sample Mean Sample Mean Sample Mean 3.86 3.88 3.84 3.88 3.90 12 3.86 2 2 32 3.76 3.83 133.88233.89 33 3.83 3.81 14 3,81 24 3.86 34 3.77 5 3.84 153.83 253 .88 35 3.86 6 3.83 16 3.86 26 3.90 36 3.80 7 3.87 17 3.82 27 3.81 3 7 3.84 3.88 3.86 3.86 9 3.84 193.8429 3.98 39 3.85 10 3 .80 20 3.87 30 3.96 600 VOUAWN- 3.79 0-1. Construct an i.chart for this process with three-sigma limits. (Do not round intermediate calculations. Round your answers to 2 decimal places.) has had a standard deviation equal to 146. The means of 39 samples of n = 20 are 22 23 32 33 Sample Mean Sample Mean Sample Mean Sample Mean 3.86 3.88 21 3.84 31 3.88 3.90 3.86 3.82 3.76 3.83 13 3.88 3.89 3.83 3.81 3.81 3.86 34 3.77 3.84 3.83 253.88 35 . 3.86 3.83 3.86 3.90 36 3.80 3.87 3.82 3.81 3.84 3.88 3.86 3.86 3.79 3.84 3.84 3.98 3.85 10 3.80 2 0 3.87 30 3.96 co 0-1. Construct an -chart for this process with three-sigma limits. (Do not round intermediate calculations. Round your answers to 2 decimal places.) UCL LCL