Basic Statistics - Old Questions
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7. Define random variable. A random variable has the following probability function:
| X | -2 | -1 | 0 | 1 | 2 |
|---|---|---|---|---|---|
| P(X) | 0.2 | K | 0.4 | 2K | K |
Find (i) K, (ii) P(X ≥ 0), (iii) E(X), and (iv) E(4X + 5). [5]
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