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Amplitude of sinusoidal functions from graph

Below is the graph of a trigonometric function. It has a minimum point at (5.4,1.25)\left(-5.4,1.25\right) and a maximum point at (7.4,6.75)\left(7.4,6.75\right).
What is the amplitude of the function?
  • Your answer should be
  • an integer, like 66
  • 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
  • an exact decimal, like 0.750.75
  • a multiple of pi, like 12 pi12\ \text{pi} or 2/3 pi2/3\ \text{pi}
units