$****$ Show all work $to$ get a chance for partial credit.

Consider two digital fuel pumps A and $B$ that could $be$ used $in$ a single gas station. Pump A has

a mean effective process time $of4$ minutes with squared$-$coefficient $of$ variation $of0\mathrm{.}5.$ Pump $Bm,$

$is1.$ Pump $A{t}_e$:

$C{T}_q$:

Pump $B{t}_e$:

$C{T}_q$:

$c_e^2$:

$CT$:

$c_e^2$:

$CT$:

$c_a^2$:

$c_a^2$:

$r_a$:$A$

$or$ three pumps $ofB{t}_e$ :

$C{T}_q$:

$(PumpsB)t_e$:

$C{T}_q$:

$c_e^2$ :

$CT$ :

$c_a^2$:

$c_e^2.$

$CT$: