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Midline of sinusoidal functions from graph

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Below is the graph of a trigonometric function. It has a maximum point at (1.2,5.5) and an amplitude of 3.5.
What is the midline equation of the function?
  • 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