INDU$211/2$X $2023-$ assignment $6$

Problem $1($chapter $8,$problem $9($a$))$

$9.$Subgroups of size n$=5$ are taken from a process.After $40$ such subgroups, sigma Ri$=930$ and sigma Xi$=3000.$The maximum and minimum values of Ri are $45$ and $3$ repectively.The Maximumand minimumm values of Xi are $86\mathrm{.}8$ and $63\mathrm{.}0$ respectively. $($a$)$ Based on all that you know, is the process in control? why or why not