Bill Clintons mail ordering process wants to measure the response time of its operators in taking customer orders over the phone. Clinton lists below the time recorded (in minutes) from five different samples of the ordering process with four customer orders per sample.

Sample	Observations
1	5,3,6,9
2	6,5,3,5
3	1,8,3,10
4	7,6,2,2
5	3,13,6,12

What is the upper range control chart limit?

	6.60
	13.96
	10.75
	15.06
	0