(b) For the following data, verify that the 5 year weighted moving average with weights 1, 2, 2, 2, 1 respectively is equivalent to 4 year centred moving average: Year Sales (K) 5 1994 1995 1996 1997 3 7 6 (c) The forecast of a product for the first week of March was 200 units, whereas the actual demand turned out to be 220 units. i. Find the forecast for the second week of March by assuming the smoothing constant (a) as 0.35. Find the forecast for the third week of March if the actual demand of the second week is 210 units. 1998 1999 2000 2001 2002 2003 2004 9 10 8 4 8 9 9 11.