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Question
Construct 3 yearly moving averages from the following data and show on a graph against the original data:
| Year | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 |
| Annual sales in lakhs | 18 | 22 | 20 | 26 | 30 | 22 | 24 | 28 | 32 | 35 |
Solution
| Year | Annual sale (in Lakhs) | 3 years moving sale | 3-year moving average |
| 2000 | 18 | --- | --- |
| 2001 | 22 | 60 | 20 |
| 2002 | 20 | 68 | 22.67 |
| 2003 | 26 | 76 | 25.33 |
| 2004 | 30 | 78 | 26 |
| 2005 | 22 | 76 | 25.33 |
| 2006 | 24 | 74 | 24.67 |
| 2007 | 28 | 84 | 28 |
| 2008 | 32 | 95 | 31.67 |
| 2009 | 35 | --- | --- |
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