A single drivethrough vaccination centre (PPV) for persons with disabilities (PwD-s) has been set up in Bukit Katil- On average. 5 recipients receiving vaccine injection in 30 minutes. The arrival of recipients are according to Poisson distribution at an average of 6 per hour. a) Determine the average number of recipient(s} in the queue. {2 marks) b)- Calculate the average time (in minutes) a recipient have to wait before receiving vaccine injection