推 AAJJBurnett:沒錯~~ 3Q 10/11 09:36
※ 引述《AAJJBurnett (叫我投手)》之銘言：
: 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?
我的想法是.........
f(1)=4/10，住院1天領保險費200元
f(2)=3/10，住院2天........200+200元
f(3)=2/10，....3..........200+200+100元
f(4)=1/10，....4..........200+200+100+100元
所以保險公司要賠的錢期望值為：
4/10*200 + 3/10*400 + 2/10*500 + 1/10*600 = 360
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有錯請指教..
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