The data (stored in CoffeeExports.xIsx & ) represent the coffee exports (in thousands of 60 kg bags) by Costa Rica from 2004 to 2016: (a) Plot the data. (2pts) (b) Fit a three-year moving average to the data and plot the results.(3pt) (c) Using a smoothing coefficient of W = 0.25, exponentially smooth the series and plot the results. (3pt) (d) What is your exponentially smoothed forecast for 2017? (2pt)