reply fast please

A quality inspector took four samples, each with five observations, of the duration of a customer service at a station. The following table shows her observations in minutes. What is the three-sigma upper control limit for the sample range?

Sample (in minutes)
#1	#2	#3	#4
10	8	9	10
11	10	11	12
10	11	10	16
12	13	12	10
13	12	14	11

		10.0225
		11.6050
		13.1875
		14.3275
		None of the above