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    Graduate Conditional expectation of exponential random variable

    Thanks for reply, it is correct but why??
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    Graduate Conditional expectation of exponential random variable

    For an exponential random variable X with rate u What is E{X|X>a} where a is a scale value from searching in internet I found that E{X|X>a}=a+E{x} but I can not prove it Help please
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    Conditional expectation of exponential random variable

    Homework Statement For an exponential random variable X with rate u What is E{X|X>a} where a is a scale value Homework Equations The Attempt at a Solution