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	20.5	21.8	22.9
Item #2	23.7	21.8	23.8
Item #3	22.1	22.2	20.4
Item #4	22.6	23.7	20.2
Item #5	23	20.2	22.5

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