A store operates with 3 checkout counters. The manager uses the following schedule to determine the number of counters in the operation depending on the number of customers in the store: No. of Customers in the Store No, of Counters in Operation 1-3 ...........................................................one 4-6 ...........................................................two More than 6 ...........................................three Customers arrive in the counter area according to Poisson distribution with a rate of 10 customers per hour. The average checkout time per customer is exponential with mean 12 minutes. If the Maximum number of the customers allowed in the (whole) system are 12. Determine the steady state probability of n customers in the checkout area