Question: 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

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 computed:

a. Using the factors in Table 10.3 , determine upper and lower limits for mean and range charts.
b. Is the process incontrol?

Sample Mean Range Sample Mean Range 3.06 2 3.15 .50 3.11 .42 46 5 3.0646 3.09 45 3.13 .41

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