x p(x) -1 1/7 0 3/7 2 2/7 4 1/7 What is the expected value or mean of x? What is the variance of x?
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| x | p(x) |
| -1 | 1/7 |
| 0 | 3/7 |
| 2 | 2/7 |
| 4 | 1/7 |
What is the
What is the variance of x?
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