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Interpret line plots with fraction addition and subtraction


During science class, groups of students measure out different volumes of vinegar. The line plot below shows the amount of vinegar used by 12 groups, rounded to the nearest 12 mL. Each point represents one group.
What is the total amount of vinegar, in milliliters, used by the 3 groups that used the most?
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi