1 2 45 3 49 47 4 52 53 Sample no 1 2 3 4 5 6 7 8 9 10 48 46 44 42 45 45 47 56 45 44 49 53 49 56 47 41 5 49 55 60 49 57 57 43 53 47 51 45 41 57 56 48 39 57 52 6 45 51 52 44 59 49 48 44 53 46 56 45 45 47 Consider the above past data from a production line. Fill in the blank cells (in grey color) by assigning any two digit numbers between 40*$ 70. a) Draw X and R charts. (60) b) is the process under control? (10) c) Is there any assignable cause? (10) d) Estimate the population mean and population variance (20)