Two competing queueing system configurations are being evaluated by simulation. The objective is to

minimize the overall average waiting time per passenger $($W$).$ After n $=5$ runs $($i $=1,...,$ n$),$ the simulation

outputs for two systems are:

i WiI WiII

$132$

$254$

$356$

$474$

$543$

$($a $4$ pts$)$ What are the mean and variance of WI and WI