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Confirming house ads error

Now that you've created a DataFrame that checks whether users see ads in the correct language let's calculate what percentage of users were not being served ads in the right language and plot your results.

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100 XP

Add a pct column to language_check_df which divides the count where language is correct by the row sum extracted using the .sum() method.
Make a line plot with the date as the x-axis and the pct column as the y-axis and show your results.

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