This looks like an exercise from a stats class, so I'll guess that r has its typical meaning. You should have been given a formula for this. Perhaps something like this?
\(\displaystyle r=\displaystyle \frac{N \sum XY - \sum X \sum Y}{\sqrt{\left[N \sum X^2 - \left( \sum X \right)^2 \right] \left[N \sum Y^2 - \left( \sum Y \right)^2 \right ]}}\)
How far did you get in calculating and plugging in the requisite sums? Please share with us any and all work you've done on this problem, even the parts you know for sure are wrong. Thank you.