Part $2$

Every hour, a random sample of two small boxes is collected and the weight of each box is measured. Results from $7$ samples:

$\backslash$table$[[,$Weight $($grams$)],[$Sample$,1,2],[1,227,241],[2,267,247],[3,251,240],[4,262,270],[5,242,249],[6,275,232],[7,252,268]]$

If the process is monitored with an R$-$chart, what is the value of the center line?

What is the upper control limit for the R$-$chart?

What is the lower control limit for the xbar$-$chart?

What is the upper boundary value between Zone A and Zone $B$ for the xbar$-$chart?