The following data give X, the price charged for a particular item, and Y, the quantity of that item sold (in thousands): Price per Piece (X) Hundreds of Pieces Sold (Y) $5 55 6 53 7 45 8 40 9 20 a....

The following data give X, the price charged for a particular item, and Y, the quantity of that item sold (in thousands):



Price per Piece (X)       Hundreds of Pieces Sold (Y)

$5                                                55
6                                                  53
7                                                  45
8                                                  40
9                                                  20


a. Compute the covariance.
b. Compute the correlation coefficient.