∵
| 10 |
 /picurl?url=https%3A%2F%2Fiknow-pic.cdn.bcebos.com%2Fd50735fae6cd7b89067046340c2442a7d9330e6c%3Fx-bce-process%3Dimage%2Fquality%2Cq_85 |
| i＝1 |
xi=17，∴=1.7，
∵变量x与y之间的回归直线方程为y=-3+2x，
∴=-3+2×1.7=0.4，
∴
| 10 |
|
/picurl?url=https%3A%2F%2Fiknow-pic.cdn.bcebos.com%2Fd50735fae6cd7b89067046340c2442a7d9330e6c%3Fx-bce-process%3Dimage%2Fquality%2Cq_85 |
| i＝1 |
yi=4．
故选：B．
