Solve the Problem $y = A \sin ( \omega x - \phi ) + B$

Solve the problem.
-The following data represents the normal monthly precipitation for a certain city.
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Draw a scatter diagram of the data for one period. Find a sinusoidal function of the form $y = A \sin ( \omega x - \phi ) + B$ that fits the data. Draw the sinusoidal function on the scatter diagram. Use a graphing utility to find the sinusoidal function of best fit. Draw the sinusoidal function of best fit on the scatter diagram.