A toy manufacturing company produces five types of toys that need a plastic wheel. The diameter of the wheel should be 170 mm. An operation manager took samples at the end of the production shift for 4 days. The following measurements, in mm , are the results. SampleX1 X2 X3 X4 X5 X6 X7 X8 172 163 164 175 168 161 168 160 2 172 162 163 173 172 174 172 176 3 165 179 179 178 160 169 165 172 4 163 174 167 177 176 173 178 175 a. Compute the upper and lower control limit of x-bar chart. b. Compute the upper and lower control limit of R chart. c. Which chart does show the process is in control?

A toy manufacturing company produces five types of toys that need a plastic wheel. The diameter of the wheel should be 170 mm. An operation manager took samples at the end of the production shift for 4 days. The following measurements, in mm, are the results. SampleX1 X2 X3 X4 X5 X6 X7 X8 1 172 163 164 175 168 161 168 160 2 172 162 163 173 172 174 172 176 3 165 179 179 178 160 169 165 172 4 163 174 167 177 176 173 178 175 a. Compute the upper and lower controllimit of x-bar chart. b. Compute the upper and lower controllimit of R chart. c. Which chart does show the process is in control