Given the data set $$ \begin{array}{lllll} X= & 3 & 6 & 5 & 2. W Y= & 12 & 5 & 0 & 15 \end{array} $$ Already calculated: $\bar{x}=4$ and $\bar{y}=8$ and $S_{x}=1.83$ and $S_{y}=6.78$ a. Calculate $\Sigma\left(x_{i}- \bar{x} ight)\left(y_{i}-\bar{y} ight) $ Answer = b. Calculate correlation coefficient (r). Answer = Write answer in 2 decimals. SP.SS.373