a$)$What is the utilization?

b$)$What is probability that there are zero customers at the counter $($either in line or being served$)?$

c$)$What is the probability that there are two or more customers at the checkout counter?

d$)$What is the probability that there are $1$or $2$customers at the counter?

d$)$What is the average number of customers waiting in line?

e$)$If the store wanted the average time in the system to be $5$minutes$,$ what would the service rate have to be$?$

f$)$What is the probability that checkout time will take between $1$and $2$minutes$?$

g$)$What is the probability that checkout time will take more than $2$minutes$?$