A pronoun is a word that's used in place of a noun or noun phrase, like “he,” “she,” or “it,”
        
                    
             
        
        
        
Explanation:
Statistics deals with the collection, analysis, interpretation of quantitative data. Often times, we portray statistical data as very exact and only limited by analytical error when we use them. 
- But the world is full of variables that are even beyond that which statistics can put figures to. 
- There are lots of assumptions and estimations to be made in our not perfect world when studying it. 
- Environmental variables are dynamic to a very significant extent and in real world models, they can fail. 
- This is why I think the author deliberately used exact and inexact/approximated numbers in his work. 
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Answer:
I don't understand the question, but my guess these are all different symbolisms for hardship. 
Explanation: