Let's calculate the mode of the following dataset: 5, 10, 15, 10, 20, 10, 25, 30. To find the mode:

1. Count the frequency of each value in the dataset.
2. Identify the value(s) that appear(s) most frequently.

In this case, the value 10 appears three times, more than any other value. Therefore, the mode of the dataset {5, 10, 15, 10, 20, 10, 25, 30} is 10.

It is possible for a dataset to have multiple modes. For instance, if the dataset is {5, 10, 15, 10, 20, 10, 25, 30, 30}, both 10 and 30 appear three times, making them both modes of the dataset.

Note that a dataset may also have no mode if all values appear with the same frequency.