Interpret dot plots with fraction operations

Problem

The plot below shows the volume of each of 14 creek water samples taken by a biologist.
What is the total volume of water in the 4 largest samples?
All measurements are rounded to the nearest start fraction, 1, divided by, 4, end fraction cup.
  • Your answer should be
  • an integer, like 6
  • an exact decimal, like 0, point, 75
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
cups