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？

    Most cities and towns in China have night markets(市场). During the day, these streets are quiet. At night, they become crowded(拥挤的)and lively. Usually, people get there at three or four in the afternoon. By 6:00, the streets are like rivers of people. Night markets are fun places to shop. You can buy clothes, shoes, and many other things. If you think the price is too high, you can bargain with the seller. You can also buy nice food. When you are hungry, you can sit down for a meal. Smelly tofu is popular, but it really smells bad! The best thing is that everything in night markets is cheap!

我国古代下列发明中，直接推动文化事业发展的是(    )

①造纸术  ②印刷术  ③火药  ④指南针