You are given a synthetic dataset stored in the data variable.

• Replace missing values in the 'Age' column with the mean value of this column and store the result in this column.
• Create an instance of an appropriate encoder, which will be used for the 'City' column and store it in the city_encoder variable. Make sure to specify the removal of the first column.
• Encode the values in the 'City' column using city_encoder and store the result in the city_encoded variable.
• Create an instance of an appropriate encoder, which will be used for the 'Income' column and store it in the income_encoder variable. Note that 'High' > 'Middle' > 'Low'.
• Encode the values in the 'Income' column using income_encoder and store the result in the 'Income' column.