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##### (a) (2 pts) Report the number and proportion of NAS for each variable using summarize_all() and/or mutate_all(). Ideally, you will write your own short

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##### (a) (2 pts) Report the number and proportion of NAS for each variable using summarize_all() and/or mutate_all(). Ideally, you will write your own short function to count NAs by summing a logical and apply it to every column via 'summarize_all', but there are ways that don't involve creating a new function

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