The manager of a bank recorded the amount of time each customer spent waiting in line during peak business hours one Monday. The grouped frequency distribution below summarizes the results.
Waiting Time (Minutes) # of Customers
0-2 14
3-5 10
6-8 9
9-11 8
12-14 5
15-17 3
18-20 1
Based on the grouped frequency distribution, you are to identify the mean and median for waiting times.