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例1某单位有6个员工借助互联网开展工作,每个员工上网的概率都是0.5(相互独立).(1)求至少3人同时上网的概率;(2)至少几人同时上网的概率小于o.3?解(1)至少3人同时上网的概率为P_6(3)+P_6(4)
Example 1 There are 6 employees in a unit who use the Internet to work. The probability of each employee accessing the Internet is 0.5 (mutually independent). (1) The probability of seeking at least 3 people to access the Internet at the same time; (2) The probability of at least several people accessing the Internet at the same time is less than O.3 Solution (1) The probability of at least 3 people surfing the Internet at the same time is P_6(3)+P_6(4)