N A2 A3
1.880 2.659
1.023 1.954
0.729 1.628
0.577 1.427
0.483 1.287
0.419 1.182
0.373 1.099
0.337 1.032
0.308 0.975
B3 B4 D3 D4
0.000 3.267 0.000 3.267
0.000 2.568 0.000 2.574
0.000 2.266 0.000 2.282
0.000 2.0890.000 2.114
0.030 1.970 0.000 2.004
0.118 1.882 0.076 1.924
0.185 1.815 0.136 1.864
0.239 1.7610.184 1.816
0.284 1.716 0.223 1.777
A machine is supposed to fill boxes to a weight of 50 pounds. Every 30 minute A sample of four boxes is tested the results are given below
Sample Box Weight (lb) X Range
49 38 39 45 42.75 11
52 51 43 61 51.75 18
56 60 32 52 50.00
49.50
51.25
47.25
55 50.75
48 47.75
51 56.50
47 47.50
38.75
49.25
57.00
48.75
52 54.75
Select the the correct upper and lower control limits.