I've got this table:
A B
1 7.8 215
2 6.8 280
3 9.4 356
4 5.2 38
5 8.2 167
6 4.8 127
7 3.7 8
8 6.2 201
9 9.7 346
10 8.1 241
how can I get the variance and covariance of A and B?
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