b. The Table below provides the annual rainfall records at gages A, B, C, D and X. The records of A, B, C and D are consistent. Gage X was temporarily relocated in January 2012 and was returned to the original station in January 2016. Adjust the 2012 to 2015 records of X, and determine the adjusted average annual rainfall at the X gage for the period 2006-2015. YEAR PRECIPITATION, Cm A B D X 170 240 250 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 210 270 290 250 190 210 230 170 180 220 190 240 280 230 220 200 200 160 160 200 270 270 230 170 180 220 180 180 200 230 290 290 260 230 220 250 200 200 250 220 160 200 240 200 220 250 190