X y x2 y2
20- 30 400 900
40- 60 1600 3600
20- 40 400 1600
30- 60 900 3600
10- 30 100 900
10- 40 100 1600
20- 40 400 1600
20- 50 400 2500
20- 30 400 900
30- 70 900 4900
25600 Σy222100


Xy

20*300=600

2400
800
1800
300
400
800
1000
600
2100
Σxy=10800
Σ+x Σ+y Σ+x2 Σ+y2
220 450 5600 22100
Σ+xy
10800

encontrar b: pendiente

A=45-3.916=41.084

Y=a+bx=y=18.9476+1.1842x