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

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Solution

Year Annual sales $3$ yearly moving average
$2000$ $18$
$2001$ $22$ $20$
$2002$ $20$ $22.66$
$2003$ $26$ $25.33$
$2004$ $30$ $26$
$2005$ $22$ $25.33$
$2006$ $24$ $24.66$
$2007$ $28$ $28$
$2008$ $32$ $31.66$
$2009$ $35$

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2005

2003

Question 2(iii)

The following line graph shows the yearly sales figures for a manufacturing company.

Compute the difference between the sales in 2002 and 2006.

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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