统计学原理计算题

1) 轻工业=（707/1661）%=42.56%，重工业=（954/1661）%=57.43% 2）设直线回归方程y=a+bx, x=∑x/n=3410/10=341, y=∑y/n=2180/10=218, ∑(X-X)2=∑X2-(∑X)2/n=49090, ∑(X-X)(Y-Y)=∑XY-∑X?∑Y/n=2