A pizza delivery service wants to track their delivery times.They take eight samples of four deliveries and record the following data.What are the upper and lower control limits of their X-bar chart? 
A) 24.9, 20.3
B) 23.8, 21.4
C) 22.6, 19.5
D) 21.1, 17.6
Correct Answer:
Verified
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