For an MM$1/$GD$/0/0$ queuing system with arrival rate i $=75$ customers per hour and service rate u $=100$ customers per hour, what fraction of the time are more than one customers in the system $($round off to $4$ decimal digits$)?$For an MM$1/$GD$/0/0$ queuing system with arrival rate i $=75$ customers per hour and service rate u $=100$ customers per hour, what fraction of the time are more than one customers in the system $($round off to $4$ decimal digits$)?$ QUESTION $2$ For an MM$1/$GD$/$o$/$co queuing system with arrival rate i $=12$ customers per hour and service rate u $=20$ customers per hour, on the average, how many customers are in the system?