In: Statistics and Probability
Assume the following joint probability distribution function where X1 and X2 are random variables denoting faulty components coming from supplier 1 and supplier 2, respectively, where a is a constant value.
X1 | |||||
0 | 1 | 2 | 3 | ||
X2 | 0 | 0.15 | 0.1 | 0.1 | 0.1 |
1 | a | 0.15 | 0.1 | 0 | |
2 | 0 | 0 | 0.1 | 0.1 | |
3 | 0 | 0 | 0 | 0.1 |
The correlation between X1 and X2 is: