X-BAR = 60.75
R-BAR = 1.78
A2 FOR N = 7 = 0.419
D3 & D4 FOR N = 7, D3 = 0.076 & D4 = 1.924
FOR X
UCL = XBAR + (A2 * RBAR) = 60.75 + (0.419 * 1.78) = 61.496
LCL = XBAR - (A2 * RBAR) = 60.75 - (0.419 * 1.78) = 60.004
FOR R
UCL = RBAR * D4 = 1.78 * 1.924 = 3.425
LCL = RBAR * D3 = 1.78 * 0.076 = 0.135
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Refer to Table 56.1 - Factors for Computing Control Chart Limits (3 sigma) for this problem....
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