The table gives the approximate economic value associated with various levels of oil recovery in a U.S. state.
|
Percent Recovery (%)
|
10
|
40
|
50
|
80
|
|
Economic Value ($ billions)
|
700
|
1400
|
1500
|
2500
|
a) Find the regression line. d(r)=_____
b) Use the regression line to estimate the economic value associated with a recovery level of 70%. = _____billion