Fix Basic Stats lesson

[quirksahern]

Definition of Done / Acceptance Criteria

Either fix column names in hgt_wgt csv file or include code for renaming columns etc in lesson.
Fix "75 +' and '75+'

Testing

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Documentation

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Dependencies

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Comments

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[milanmlft]

Would suggest leaving the faulty data as it is and include code to clean it in the notes. It's a good example of what can typically go wrong with real data and how you would go about cleaning it up.