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Неперервну в ипадкову величину   задано щільністю йм...

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Неперервну випадкову величину

xi

 задано щільністю ймовірностей

p subscript xi left parenthesis x right parenthesis equals open curly brackets table attributes columnalign left end attributes row cell table row cell 0 comma space space space space space space space space space space space space space space space space space space x less or equal than 1 semicolon end cell row cell -2 x plus 4 comma space space space space 1 less than x less or equal than 2 semicolon end cell end table end cell row cell space space 0 comma space space space space space space space space space space space space space space space space space space x greater than 2. space end cell end table close

Знайти дисперсію випадкової величини xi.

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