A pizza delivery service wants to track its delivery times. They take 3 samples of 5 deliveries and record the following data. What is the upper control limit (UCL) of their X-bar chart? (Your answer should be in 2-decimal places)

Sample #	1	2	3
Item #1	20.7	23.6	21
Item #2	22	20.6	22.5
Item #3	22.1	22.9	20.2
Item #4	22.2	20.1	21.2
Item #5	22	22.7	22

For your computation, you may need to refer to the following coefficient table:

SAMPLE SIZE n	A2	D3	D4
2	1.88	0	3.27
3	1.02	0	2.57
4	0.73	0	2.28
5	0.58	0	2.11
6	0.48	0	2