Answer:
20
Step-by-step explanation:
28/16=1.75
35/1.75=20
what a question do u have
solution:
\sum ei =0
that is
\sum (yi-yiˆ)=0
means,
\sumyi = \sum yiˆ
yi = \alpha +\beta xi+ei
yiˆ=\alphaˆ+\betaˆxi
so,
\sumei=0
hence proved
