We have to find the mode of the given data.
Mode - It is that value of the variables that occurs most frequently.
(i) 10, 8, 4, 7, 8, 11, 15, 8, 6, 8
Here, 8 occurs most frequently. Hence, the mode of the data is 8.
(ii) 27, 23, 39, 18, 27, 21, 27, 27, 40, 36, 27
Here, 27 occurs most frequently. Hence, the mode of the data is 27.