Please solve this problem according to decision making course and if you use excel i would like to have screen photos of excel resaults

a) A system has one service facility that can service 10 customers per hour. The customers arrive at an average rate of 6 per hour. What is the Utilization? b) A situation in which a mechanic is responsible for repairing a pool of fleet vehicles should be analysed for a waiting line system with a calling population. c) If customers arrive at a candy shop every 8 minutes on average, what is the arrival rate? d) What is the utilisation rate if =24 and =30