The value that appears "most" in a set of data is called the mode. (There can be multiple modes, but there can be no "Maximum")

1)2, 2, 3, 3, 4, 4, 5, 5: No pattern.

Because the frequency of different data is exactly the same, accounting for 2 times. There is no maximum and there is no minimum.

2) 3, 3, 3, 3, 3, 3: No pattern.

Because there is only one kind of data, you can't compare it.