The sum of the deviations from the mean of a dataset is always equal to 0. This is because the mean represents the central point of the data, and deviations above and below the mean cancel each other out when summed.

So, the correct answer is:

b. 0

Would you like more details or have any questions?

Here are 5 related questions:

1. How do you calculate the mean of a dataset?
2. What is the difference between variance and standard deviation?
3. Why do deviations from the mean always sum to zero?
4. How can you calculate the sum of squared deviations?
5. What is the purpose of calculating deviations from the mean?

Tip: Always remember that the sum of deviations from the mean will be zero, which is an important property in statistics.