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The time to replace vehicle wiper blades at a service center was monitored using a mean and a range chart. Six samples of n = 20 observations were obtained and the sample means and ranges are: Sample " Mean Range 3.06 0.42 2 3.15 0.50 3 3.11 0.41 4 3.13 0.46 5 3.06 0.46 6 3.09 0.45 From Table 10-3, what will be the right factors for R charts? O:0, 2.57 0, 2.00 3 0.28, 1.72 0 0.41, 1.59