What is the probability that a customer must wait in queue before being served?

a$.0\mathrm{.}00$

b$.0\mathrm{.}25$

c$.0\mathrm{.}75$

d$.1\mathrm{.}00$

What is the probability that a customer can go directly into service without waiting in line?

a$.0\mathrm{.}00$

b$.0\mathrm{.}25$

c$.0\mathrm{.}75$

d$.1\mathrm{.}00$

How many customers will be in the system on average at any one time?

a$.0\mathrm{.}375$

b$.0\mathrm{.}50$

c$.2\mathrm{.}25$

d$.3\mathrm{.}00$

What is the expected number of minutes a customer actually will be served?

a$.45$

b$.7\mathrm{.}5$

c$.30$

d$.22\mathrm{.}2$

If the store adds an additional server to its system, what happens to a customer's average service time?

a$.$ increases

b$.$ decreases

c$.$ it is unchanged

d$.$ depends on the arrival rate