Day... Mean... Range
1... 13.6... 3.5
2... 14.3... 4.1
3... 15.3... 5
4... 12.6... 2.8
5... 11.8... 3.7
6... 12.9... 4.8
7... 17.3... 4.5
8... 13.9... 2.9
9... 12.6... 3.8
10... 15.2... 4.6

n=4 for a 10-day period
compute control limits for the range
compute control limits for the mean

I understand where most numbers go in the formula, but I do not understand how to compute the formula once the numbers are plugged in. HELP!

Can you be more specific like what kind of section are you learning on.. can you please provide the formula then and I can check what you did so far. All I understand from here is that you have to choose 4 from this 10 days.