TRUE OR FALSE, I need reason for 1.2.5.7.9

(1) If a waiting customer becomes impatient, he may decide to balk. (2) Jockeying is exercised by customers in a single-server facility in the hope of reducing their waiting time. (3) In a queuing system, if the arrivals occur according to a poisson distribution, the inter arrival time is exponential distributed. (4) The mean and variance of the Poisson distribution may not be equal. (5) Under the Poisson assumption, two arrivals can occur during a very small time interval. (6) An arriving customer may balk if he expects a long waiting time. (7) If the time between successive arrivals is exponential, the time between the occurrence of every third arrival is also exponential. (8) The arrival rate in the Poisson distribution equals the mean of the exponential inter arrival time. (9) In a single-sever queuing system, steady state can be reached after a sufficiently long period only if the arrival rate is less than the service rate. (10) In the preemptive priority queues, a service can be interrupted in favor of an arriving customer with higher priority