x-rain y-wind z-temperature Zi - Z x* z X2 yz Z2 16 12 192 256 625 144 15.2 30 -1 ? 15.2 231.04 900 ? 60 ? 13.2857 0 0 3600 0.25 ? 2 ? 0.5 0.0625 784 4 40 36 -2 ? -80 1600 1296 ? 44 21.7143 300 144 1936 16 33 -3 ? -48 256 1089 9 x - 14.2071, Zy = 256, z = 3.2857, Variance of x = 179.0337, Variance of y = 144.6190, Variance of z = 135.2381 a) Calculate the MAD of the z(temperature). b) Find the location of 60th percentile of the y (wind). C) Environment Canada wants to know, which data set (x - rain or y - wind) has less relative variation? Justify your answer mathematically. d) Which measure of central location is appropriate whenever we wish to estimate the expected mean return, or growth rate, for a single year in the future