为了解某校九年级男生身高情况，从该校九年级男生中随机选出10名男生，测量出他们的身高（单位：cm），并整理成如下统计表：

根据以上表格信息解决如下问题：

（1）求出这10名学生身高的平均数、中位数和众数；

（2）如果约定：选择某个量为标准，将身高在该选定标准的±2%范围之内都称为“普通身高”．请你选择（1）中的某个统计量作为标准．并按此约定找出这10名男生中具有“普通身高”的是哪几位？

（3）若该校九年级男生共有280名，按（2）中选定标准，请你估算该年级男生中具有“普通身高”的人数约有多少名？

根据括号中所给的汉语写出单词。
⑴Those boys like playing hide-and-seek and often hide ____ (在…之中) the trees.
⑵How beautiful she is and her skin is as ____ (光滑的)as silk.
⑶She is looking forward to____ (收到) letters from her friends.
⑷The heavy smog makes it more difficult for us to see traffic signs ____ (清楚地).
⑸After several____ (星期) study, we will have our senior high school entrance exam.
B）根据句子意思，用括号中所给单词的正确形式填空。
⑹In the morning, taking a walk and____ (breathe) some fresh air are good for your health.
⑺He was ____ (terrible) hurt and had to stay in hospital for a long time.
⑻Many____ (wood) houses have been built for the tourists in this area recently.
⑼Mr. Brown ____ (prefer) hiking to running when he was in his twenties.
⑽Tian' anmen Square is always filled with ____ (visit) on National Day.