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Jun 17th, 2019
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  1. >car_df
  2.  
  3. Grade Speed Age
  4. 7 54 13
  5. 10 NA 4
  6. NA 43 23
  7. 3 NA NA
  8. 1 87 12
  9. NA NA NA
  10.  
  11. > mean_col
  12.  
  13. Grade Speed Age
  14. 3.6 30.67 8.67
  15.  
  16. Grade Speed Age
  17. 7 54 13
  18. 10 30.67 4
  19. 3.6 43 23
  20. 3 30.67 NA
  21. 1 87 12
  22. 3.6 30.67 NA
  23.  
  24. car_df$Speed <- replace(is.na, mean_col$Grade)
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