$($a$)$

Figure PC

$($b$)$

$($d$)$

$($e$)$

$($c$)$

$37.$ In Figure PC$,$ assume that $50$ parts are measured each day for seven days and these measurements are plotted as shown for $($a$)$ through $($e$).$ Regarding these normal distributions, which of the processes would be considered in control regarding the $R$ chart?

a$.($c$)$ only

b$.($d$)$ only

c$.($a$),($b$),$ and $($c$)$

d$.($d$)$ and $($e$)$

e$.$ None of these processes are in control on the $R$ chart.

$38.$ In Figure PC$,$ assume that $50$ parts are measured each day for seven days and these measurements are plotted as shown for $($a$)$ through $($e$).$ Regarding these normal distributions, which of the processes would be considered in control regarding the Xbar chart?

a$.($c$)$ only

b$.($d$)$ only

c$.($a$),($b$),$ and $($c$)$

d$.($d$)$ and $($e$)$

e$.$ None of these processes are in control on the $R$ chart.