Explanation
The original data set is
93, 77, 100, 68, 94, 83, 86, 88, 92, 85
Let's sort from smallest to largest.
68, 77, 83, 85, 86, 88, 92, 93, 94, 100
Notice carefully how there isn't a value that shows up more often compared to the others, which means that there is no mode in this data set.
The mode of a data set is the most frequent value. In this set, each value shows up exactly once. If we had something like {68,77,68,83,85} then the mode would be 68 since it shows up the most.