please answer both ....the questions within 30 minutes. make sure the calculations are explained in very detailed manner also formatting is proper, Attempt the answer only if your are 100% sure that its correct. else leave it for other tutore otherwise i will give negative ratings and will also report your answer for unprofessionalism. Make sure the answer shows detailed calculations and is 100% correct.

3. 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: Sample Mean Range Sample Mean Range 3.06 42 3.13 .46 3.15 50 5 3.06 .46 3.11 41 6 3.09 .45 a Using the factors in Table 10.3, determine upper and lower limits for mean and range charts. b. Is the process in control