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Знайти дисперсію дискретної випадкової величини , якщо
X | 17 | 19 | 26 | 39 | 42 | 47 | 53 | 64 |
P | 0.1 | 0.02 | 0.08 | 0.04 | 0.06 | 0.3 | 0.2 | 0.2 |