Thirty customers bought items in a convenience store, and the clerk recorded the number items purchased by each customer. Construct an ungrouped frequency distribution for the data, items purchased by each customer.
2 9 4 3 6
6 2 8 6 5
7 5 3 8 6
6 2 3 2 4
6 9 9 8 9
4 2 1 7 4
1 (2)
2 (5)
3 (30
4 (4)
5 (2)
6 (6)
7 (2)
8 (3)
9 (9)