It’s okay for your data to have skewness, it can indicate outliers in your data set. If your data demonstrates skewness, it’s not a good or bad thing. It is the shape of your data.

Skewness is commonly found when analyzing data sets, as there are situations where skewness is simply a component of the data set being analyzed. For example, consider the average human lifespan.

This can be done using a vastly smaller, less skewed, data set. The majority of the data might be strongly biased, therefore, but the system trained on it need not be.