has decided to use an R -Chart to monitor the changes in the variability of their 68.00 pound industrial belts.

Please can you help me understand this lesson help me ASAP

Berkeley Inc. has decided to use an R-Chart to monitor the changes in the variability of their pound industrial belts.  The production manager randomly samples industrial belts and measures the weight of the sample (in pounds) at successive time periods.

Here is the table below.

• Attachment 1
• Attachment 2