Please help me to solve these 2 qs. Answer must me correct. Consider decimals etc

qs 2

Garcia's Garage desires to create some colorful charts and graphs to illustrate how reliably its mechanics "get under the hood and fix the problem." The historic average for the proportion of customers that return for the same repair within the 30-day warranty period is 0.09. Each month, Garcia tracks 120 customers to see whether they return for warranty repairs. The results are plotted as a proportion to report progress toward the goal. If the control limits are to be set at two standard deviations on either side of the goal, determine the control limits for this chart. In March, 18 of the 120 customers in the sample group returned for warranty repairs. Is the repair process in control? The UCLA equals and the LCL, equals - (Enter your responses rounded to three decimal places.) A textile manufacturer wants to set up a control chart for irregularities (e.g., oil stains, shop soil, loose threads, and tears) per 100 square yards of carpet. The following data were collected from a sample of twenty 100-square-yard pieces of carpet: Sample 6 Irregularities 8 Sample 11 12 Irregularities 12 7 Sample Irregularities 1 14 2 15 17 6 5 9 Sample 16 17 18 7 Irregularities 11 18 7 18 14 6 18 02 8 13 4 8 16 16 14 9 10 19 17 14 15 20 a. Using these data, set up a c-chart with z=3. The UCLc equals and the LCLc equals (Enter your responses rounded to two decimal places.)