What is the mode of the numbers: 153, 157, 163, 165, 166, 169, 170, 173, 176, 185?
There is no mode.
But in this case, each value appears exactly once each, so there is no "most frequent."
If one of the numbers had occurred even twice, that would have been the mode, but that is not the case.
So there is no mode for this list of numbers.