GoPro is a training company that helps athletes applying for college improve their sports. Most colleges have their application deadline at the end of December, so the third and fourth quarters tend to be the busiest for the company. Based on the last three years, management has collected a set of old demand data for the various quarters:

Using a smoothing parameter of 0.2 and an initial forecast for the deseasonalized demand of 130, forecast demand for the first four quarters in 2015.

Year 2012 2013 2014 Quarter 1 2 AWNAWN A WN- 3 4 2 3 4 1 2 3 4 Demand 111 120 350 333 130 109 299 305 143 122 401 307