Neighbouring rain gauge station A, B, C, D, E and F have normal rainfalls of 610,554,468,606,563,382mm respectively during a strom A,B,C,E and F have reported rainfalls of 22,29,35,13,25mm respectively and station D didnt report as it was in operative. Estimate the missing strom rainfall at D by the airthmetic average and normal ratio method?