$89,90,88\mathrm{.}5,89\mathrm{.}5,$ and $88.$ is the process in control?

$0$

Yes

No$,$ one or more averages exceeded the limits$.$

Not enough information to tell.

No$,$ there is a distinguishable trend.

No$,$ two or more consecutive points are very near the lower $($or upper$)$ limit