After finding the values of the mean and range for each decade, find the values of x?,

Question:

After finding the values of the mean and range for each decade, find the values of x?, and R?. Also find the values of LCL and UCL for an R chart, and find the values of LCL and UCL for an x? chart.

Use the data in the following table, which lists carbon dioxide concentrations (in parts per million) for each year from 1880 to 2009, with projected values used for the last four years. Atmospheric carbon dioxide is believed to be the result of human activity and a major contributor to the greenhouse effect that is at least partly responsible for global warming.