Answer :

Mode is just the set of data value that appears most often.

Let us arrange the data values in ascending order so that observation can be made easily.


10, 11, 15, 15, 15, 15, 16, 16, 16, 17, 17, 17, 17, 18, 18, 19


Note the appearances now,


10 appears 1 time


11 appears 1 time


15 appears 4 times


16 appears 3 times


17 appears 4 times


18 appears 2 times


19 appears 1 time


15 and 17 both appears most times, that is, 4 times.


Thus, mode is 15 and 17.


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