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 1 3.06 0.42 2 3.15 0.50 3.11 0.41: 3.13 0.46 S 3.06 0.463 6 3.09 0.45 From Table 10-3, what will be the right factors for R charts? 0,2.57 0,2.00 0.28, 1.72 0.41, 1.59