Day Package $1$ Package $2$ Package $3$ Package $4$

Monday $23222324$

Tuesday $23211921$

Wednesday $20192021$

Thursday $18192019$

Friday $18202220$

$($a$)$ Calculate the R value for each sample $($day$)$ and R$-$bar value.

$($b$)$ Create upper and lower control limits for the R chart.

$($c$)$ Based on the R chart, is this process in control?