Word Count : 169

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दी गई प्रायिकता घनत्व फलन (PDF) है: \[ f(x) = \theta e^{-\theta x}, \quad x \geq 0, \quad \theta > 0 \] हमें \( E(x) \) (अपेक्षित मान) ______ ___ _________ ___ _______.
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