A cyber-caf has 6 PCs that customers use or internet access. Customers arrive according to a poisson process with average rate six per hour. Customers who arrive after the six PCs are being used are blocked out and have to go elsewhere for the internet access. Suppose the time a customer spends using a PCs is exponentially distributed with a mean of 8 minutes.

i.What percentage of arriving customers is blocked?

ii. What is the actual arrival rate at the cyber-caf?

iii. What fraction of the arriving customer would be blocked out, if one of the PCs is

out of service for a long time.