求助英文统计学题Let X represent the number of visits to a GP over th

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求助英文统计学题
Let X represent the number of visits to a GP over the last 12 months.From past record
x 0 1 2 3 5
P(X=x) 0.5 0.2 0.1 0.1 0.1
What is the expected number of visits given that a patient has had at least one visit?

我有个小问题,你是看不懂题目还是看懂了不会做.
我先把题目给你翻译一下吧
让X表示在过去12个月内访问GP的访问者的个数,根据过去的经验数据,我们有
X=0,1,2,3,5的时候的对应的概率
问题问的是,在人数至少为1的情况下,访问者数量的条件期望是多少?
希望我翻译清楚了.

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