one week has 7 days, C does volunteer work, the probability he is need on each day is independent. the probability that he is needed during weekdays (Monday -Friday) is 0.5, the probablity that he is needed during weekend is 0.2. what's the probablity that he is needed on Friday or Saturday or Sunday in a month?
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发表于 2021-12-19 13:30:28
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