同学,您这个题目不是CMA题目。 假设销量为x, 销售费用y x 900 950 980 x² 810,000 902,500 960,400 y 64 68 69 x*y 57,600 64,600 67,620 x平均数=943.33, y平均数=67, X平均数*Y平均数=63,203.11, 所以∑x*y=57,600%2B64,600%2B67,620=189,820,∑x²=2,672,900, 所以b=(∑xy-5x*y)/(∑x²-5x²)=(189,820-5*63203.11)/(2,672,900-5*943.33^2)=0.071 a=y-bx=67-0.071*943.33=0.02357 故直线方程为y=a%2Bbx=0.02357%2B0.071*x 当x=1050 y=0.02357%2B0.071*1050=74.57357 感谢您的参与,祝您生活愉快。