The manager of a retail clothing store is concerned about the “shrinkage” (shrinkage in retail refers to losses from emp

[answerhappygod]

The manager of a retail clothing store is concerned about the
“shrinkage” (shrinkage in retail refers to losses from employee and
customer theft and inventory mistakes.) The manager decides to use
an Average and Range Control Chart to monitor loss (in $) due to
shrinkage by measuring the shrinkage twice each month. The data for
the last few months is shown.
What percentage of the time will they meet the manager's
goal?
Obs 1
Obs 2
June
301
393
July
652
484
August
643
246
September
555
469
October
466
162
November
247
359
Subgroup Size
A2
D3
D4
2
1.880
0
3.267
3
1.023
0
2.575
4
0.729
0
2.282
5
0.577
0
2.115