The mode of the data 5,5,5,5,5,1,2,2,3,3,3,4,4,4,4 is

We can arrange the data in ascending form as:

1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5

This gives us an ease of observation.

Here, 5 is coming 5 times and it is the most occurring value in the data.

Since, mode is a number having the highest frequency of all numbers in the data.

⇒ Mode = 5

Thus, option (D) is correct.