设随机变量X-B(4,1/3),则P(x﹥0)=____.

设随机变量X-B(4,1/3),则P(x﹥0)=____.
【正确答案】:65/81。解析:由x~B(4,1/3),得P(X﹥0)=1-P{X=0) =1-C04 (1/3)0×(2/3)1一=65/81.