Detirmine the 4point centered moving average for the data

a german motor spares company reports the following demand for a certain power steering pump from 2002 to 2004:
year quarter 1 quarter 2 quarter 3 quarter 4
2001 78 62 56 71
2002 84 64 56 82
2003 92 70 63 85
2004 100 81 72 96
petity0123
Asked Feb 02, 2015

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