Problem 4 ( Data), please solve problem 12 only

LO3 12. Design specification for the concrete slabs in Problem 4 is between 78 kg and 81 kg. a. Based on the data given in Problem 4, is the specifica- tion being met? b. Estimate the process standard deviation from the aver- age range in Problem 4 using Formula 10-4. Then cal- culate the Cp. Is the process capable? Compare with your answer to part a. LO2 4. Six samples of five observations each have been taken of 80 kg concrete slabs produced by a machine, and the results are displayed below. a. Using factors from Table 10-3, determine the upper and lower control limits for sample mean and range, and decide if the process is in control. b. A new sample results in the following slab weights: 81.0, 81.0, 80.8, 80.6, and 80.5. Use the control limits deter- mined in part a to decide if the process is still in control. Sample 1 2 3 4 5 6 79.2 80.5 79.6 78.9 80.5 79.7 78.8 78.7 79.4 79.4 79.6 80.6 80.0 81.0 80.4 79.7 80.4 80.5 78.4 80.4 80.3 79.4 80.8 80.0 81.0 80.1 80.8 80.6 78.8 8