Among the customers who purchase a computer hard drive at a computer equipment store, some will...
Among the customers who purchase a computer hard drive at a computer equipment store, some will also buy a printer, a keyboard, or both. For those customers who purchased a computer hard drive, the manager has determined the following joint probability distribution for of the number of keyboards, X, purchased by the customer, and the number of printers, Y, purchased by the customer:
| X (Keyboards) | |||
| Y (printers) | 0 | 1 | |
| 0 | 0.25 | 0.10 | |
| 1 | 0.20 | 0.45 | |
What is the covariance between X and Y?
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