温家宝说：一个船队，决定它的快慢的不是航行最快的船只，而是最慢的船只，这表明构建社会主义和谐社会必须坚持（    ）

为迎接***建党90周年，某校举办“红歌伴我成长”歌咏比赛活动，参赛同学的成绩分别绘制成频数分布表和频数分布直方图（均不完整）如下：

（1）求m，n的值分别是多少；

（2）请在图中补全频数分布直方图；

（3）比赛成绩的中位数落在哪个分数段？

      Nancy and Sheila are in the same class. They are friends. Nancy wants to invite Sheila to dinner on Sunday. But Sheila doesn't know the way. Now Nancy is telling her.

"It's easy. You can take No. 4 bus. After you get off at Red Road. cross it and take the first turning on the left. Walk along the road for about five minutes. and then you'll see a big tree. Go straight on for about a hundred meters. and you will see a big red house. This is not my home. Go past the big house about four hundred meters. and you'll see a small yellow house beside a little tree. Then you can open the door with your foot."0

    "With my foot?" asks Sheila. "Why?"

    "Well. you won't come to my house empty-handed(空手地)， will you?"  answers Nancy.