... (X |- x) (yi - y) -1 04 -1 38 121 -1 09 150 -1 33 -2 02 382 -1 79 232 -5 6 -7 8 29 120 -7 5 217 -8 -1 43 -1 8 94 39 -1 8 -1 08 19 158 -1 20 333 -1 .3 -2 13 -1 9 151 57 -1 2 -1 75 (X i - X )2 (y - y)2 (X | - X )(X ... Nm Qi, m3 Qi - Qih ;Qi-Qlhr /s Ki Ki- ( K ,-lr (Ki - l)3 1962 440 -1 10.2 12 144 0,928912398 -0 ,071 0.005053447 -0 ,0003592 1963 188 -3 62,2 131 189 0,766352729 -0 ,2.34 0.054591047 -0 ,0127550 1964 ... ^x,y, - n x y a = - (2.48) % * )- * /=I yp-**.y b = (2.49) Nờu cho b = 0, hay di trc ta v im gc ng vi giỏ tr trung bỡnh ca X v y ta cú : -x ) ( y , - y) a = - ^ - - (2.50)...