(Answered) : ATM transaction times for a specific bank branch are being monitored and the following data has been collected. Each sample cont

ATM transaction times for a specific bank branch are being monitored and the following data has been collected. Each sample contained 17 items.

Sample Mean Range
1 4.06 .42
2 4.15 .50
3 4.11 .41
4 4.13 .46
5 4.06 .46
6 4.20 .45
Calculate the lower and upper control limits for the mean. (Keep three decimal places)

Question 29 options:

Lower = 4.028

Upper = 4.208

Lower = 4.118

Upper = 4.568

Lower = 4.098

Upper = 4.138

Lower = 4.028

Upper = 4.568

Lower = 3.668

Upper = 4.568

Expert Answer

Capability index = upper specification limit- x , x – lower specification limit / 3 alpha

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