(1)各组的频率分别是0.1,0.2,0.3,0.2,0.1,0.1,
所以图中各组的纵坐标分别是0.02,0.04,0.06,0.04,0.02,0.02
;
(2)设收入(单位:百元)在[15,25)的被调查者中赞成的分别是A 1,A 2,A 3,A 4,不赞成的是B,从中选出两人的所有结果有(A 1A 2),(A 1A 3),(A 1A 4),(A 1B),(A 2A 3),(A 2A 4),(A 2B),(A 3A 4),(A 3B),(A 4B),其中选中B的有(A 1B),(A 2B),(A 3B),(A 4B)
所以选中的2人恰好有1人不赞成“楼市限购令”的概率是
。