According to Statista, in 2016, global retail sales of chocolate amounted to approximately $98.2 billion, making choclates one of the most popular snacks in the world. A random sample of 15 consumers were given varying quantities of chocolates for four weeks. The following (x, y) data shows the number of chocolate cups, X, and the number of days required for recovering, , for each consumer:

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

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(3,23) (1,11) (10, 24) (8,33) (4,42) (8,35) (8,27) (5,42) (9,38) (7,29) (1,14) (2,22) (11,26) (2,31) (3,36)