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3. The time in minutes to replace vehicle wiper blades at a service center was monitored using a mean and a range chart. Six samples
3. The time in minutes 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 were computed: Sample Mean Range Sample Mean Range 1 3.06 .42 4 3.13 .46 2 315 A50 5 3.06 .46 3 311 A41 6 3.09 .45
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