a. Mx=3685,My=15525M_x = \frac{368}{5}, M_y = \frac{1552}{5}Mx=5368,My=51552 b. xˉ=9295,yˉ=38895\bar{x} = \frac{92}{95}, \bar{y} = \frac{388}{95}xˉ=9592,yˉ=95388