According to the Office for National Statistics (ONS), the monthly growth rate in the quantity of goods bought in Great Britain increased by 1.0% in January 2019, after a 0.7% decline in December 2018.
Following is a random sample of price per piece (£), X, and quantity sold, Y (in thousands):

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

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Price (x) £6 8 10 9 20 Thousands of Pieces Sold (y) 90 60 70 30 100