Based on the data given in the following table, find the arithmetic mean of the number of major meals that included a potato-based dish, which the 39 students surveyed, had eaten in a week.

Number of major meals  39 students had eaten in  a week with a potato-based dish included	Frequency
1	3
2	2
3	2
4	5
5	5
6	4
7	6
8	3
9	5
10	3
11	1
Total Frequency	39