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（第二章）习题参考答案3T1-用X表示掷两次出现的点数之和，则分布律：X23456(1,1)(1,2)(2,1)(1,3)(2,2)(3,1)(1,4)(2,3)(3,2)(4,1)(1,5)(2,4)(3,3)(4,2)(5,1)p1/362/363/364/365/36789101112(1,6)(2,5)(3,4)(4,3)(5,2)(6,1)(2,6)(3,5)(4,4)(5,3)(6,2)(3,6)(4,5)(5,4)(6,3)(4,6)(5,5)(6,4)(5,6)(6,5)(6,6)6/365/364/363/362/361/36即分布律：X012p22/3512/351/35（2）分布函数：2.32.42.5Book
