Question

The following scatter diagram shows two sets of data that show high negative correlation:
Use extrapolation to predict the value of $y$ when $x=1$

• A. $4.7$
• B. $4.8$
• C. $4.9$
• D. None of these

Answer 1

The correct option is B $4.8$

To predict $y$ value at $x=1$ consider $y$ values at end point

At $x=2y=4.55$

$x=11y=2.2$

$(y-2.2)=\frac{(4.55-2.2)}{(11-2)}(1-11)$

$y-2.2=\frac{2.35}{9}\left(10\right)$

$\therefore y=4.8$