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Interpret dot plots with fraction operations

The plot below shows the length of 1515 strings used in a pendulum experiment.
How much longer is the largest string than the length of the three smallest strings combined?
All measurements are rounded to the nearest 14\dfrac14 inch.
  • Your answer should be
  • an integer, like 66
  • an exact decimal, like 0.750.75
  • a simplified proper fraction, like 3/53/5
  • a simplified improper fraction, like 7/47/4
  • a mixed number, like 1 3/41\ 3/4
inch