I need step by step typed solution with explanation don't use AI bot otherwise I will report to you answer. Find a Doctor (FaD) is a small startup that helps people find a physician that best meets their needs (location, insurance accepted, etc.). During a "slow" time for FaD, 7 staff members take calls from customers. On average, one call arrives every 5 minutes. On average, each staff member spends 20 minutes with each customer. How long (in minutes) does a customer spend on average waiting on hold before he or she can start speaking to a representative? (Choose the answer closest to your calculations) a)15.2 minutes b)0.7 minutes c)1.2 minutes d)11.4 minutes