Let the random variable X be the number of days that a certain patient needs to be in the hospital. Say X has the p.m.f. 5-x f(x)= ------- x=1,2,3,4. 10 If the patient is to receive from an insurance company 200(元) for each of the first two days in the hospital and 100(元) for each day after the first two days, what is the expected payment for the hospitalization? --

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