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Question -

The Fergus Fun Factory produces playground sets for municipalities throughout Southern Ontario. The manager of the quality control department randomly selects 10 playground sets as they come off the production line and counts the number of blemishes on each unit. The sample results are shown below:

Sample	1	2	3	4	5	6	7	8	9	10
# Blemishes	13	9	14	11	11	12	14	13	8	15

Given the above information, what is the two-sigma upper control limit that should be used to control this process?

		14.6
		16.3
		18.9
		19.6
		21.9