Question: find UCL (only answer in the square with "?")

	SAMPLE
Observation	1	2	3	4	5
1	12,11	12,15	12,09	12,12	12,09
2	12,10	12,12	12,09	12,10	12,14
3	12,11	12,10	12,11	12,08	12,13
4	12,08	12,11	12,15	12,10	12,12	Note: Only fill out the yellow highlighted cells.
	12,10	12,12	12,11	12,10	12,12	Find the averages of each sample. (2 points)
	0,02					Calculate the standard deviation of the process using the relevant Excel formula. Round to 2 decimals. (2 points)
n	4
						Calculate the standard deviation of sample means using formula on page 422. Round to 2 decimals. (4 points)
z	3
	12,11					Calculate the average of the sample means. Round to 2 decimals.(2 points)
UCL	??					Calculate the UCL using the formula on page 422. Round to 2 decimals. (5 points)
LCL						Calculate the LCL using the formula on page 422. Round to 2 decimals. (5 points)