x
x1
x2
x3
x4
5
y
2.5
4.6
5.4
n
7.5
若x1+x2+x3+x4=10,计算得回归方程为 y∧ =2.5x﹣2.3,则n的值为( )
A:9
B:8
C:7
D:6
They're going to have breakfast ____ ____ ____.
石____(壁 碧) 欧____(州 洲)
(陡 徒)____峭 (急 疾)____飞
(透 绣)____亮 逃____(脱 拖)
温____(暖 缓) (列 例)____车