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A commuter train arrives punctually at a...

A commuter train arrives punctually at a station every half hour. Each morning, a student leaves his house to the train station. Let x denote the amount of time, in minutes, that the student waits for the train from the time he reaches the train station. It is known that the pdf of X is `f(x)={{:(1/30, 0 lt x lt 30), (0, "elsewhere"):}`. Obtain interpret the expected value of the random variable X.

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