Sample Mean and Range Chart

The Mean & Range Chart shown below has been prepared and is ready for plotting. It is ready for use in a process where the variable feature being monitored is the weight (in grams) of battery covers.

In order to follow the exercise more easily, it is recommended that you print out a sample chart to work on. Clicking on the following link will open a new window with a page containing a sample chart which you can print out and which you will need to fill in as you go through the exercise.

Looking at the printed chart, what is the sample size for this control chart?