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Jun 18th, 2018
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  1. $ cat file.txt
  2. 1 495.03
  3. 2 503.76
  4. 3 512.28
  5. 4 520.75
  6. 5 529.17
  7.  
  8. awk '{sum+=$1} NR%3==0 {print sum/3; sum=0}'
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