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Databricks Certified Machine Learning Associate · Databricks
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- Correct answer : A — The argument is flawed, because keeping the column average unchanged is not the same as filling in a typical, realistic income for most missing households. A . Mean imputation trivially preserves the column average by construction, but the goal of imputation is a plausible value per household, and the mean is skewed high by the top earners, misrepresenting most missing rows. B . Preserving the exact mean is a side effect of mean imputation, not the actual goal; the relevant question is whether the imputed value is representative, and skew undermines that for the mean. C . Annual income is a continuous numeric feature, so the mode is not the natural choice; this claim also does not engage with the colleague's argument about the mean at all. D . A median is well defined for any ordered numeric distribution including a right-skewed one, so this claim about the median being unavailable is factually incorrect.