中国男子篮球职业联赛总决赛采用七场四胜制(即先胜四场者获胜).

中国男子篮球职业联赛总决赛采用七场四胜制(即先胜四场者获胜).进入总决赛的甲乙两队中,若每一场比赛甲队获胜的概率为乙队获胜的概率为,假设每场比赛的结果互相独立.现已赛完两场,乙队以暂时领先.

(Ⅰ)求甲队获得这次比赛胜利的概率;

(Ⅱ)设比赛结束时两队比赛的场数为随机变量,求随机变量的分布列和数学期望

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