Question: Split the data set into subsets based on Department. How many subsets are created? Which subset contains missing values? How many missing values are in

Split the data set into subsets based on Department. How many subsets are created?
Which subset contains missing values?
How many missing values are in that subset?
Use the imputation strategy to replace the missing values with the mean. What is the value of the replacement (i.e. the mean)?

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