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प्रश्न
Choose the correct alternative:
Let X be random variable with probability density function
`f(x) = {(2/x^3, x ≥ 1),(0, x < 1):}`
Which of the following statement is correct?
विकल्प
Both mean and variance exist
Mean exists but variance does not exist
Both mean and variance do not exist
Variance exists but mean does not exist.
उत्तर
Mean exists but variance does not exist
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