The mode is when there is the same number displayed multiple time.
E.G. 1, 4, 6, 2, 55, 62, 81, 21, 4, 9, 10, 20, 11, 1, 4, 4, 6, 4, 20, 51, 69, 21.
The mode would be 4 because it is the most displayed number on this data.
So to answer your question, the correct answer would be 63, because it is the most displayed number on the data.
