经济改革后，人民的平均收入上升了。

Jīngjì gǎigé hòu, rénmín de píngjūn shōurù shàngshēng le.

After the economic reforms, people's average income increased.

我们的学生平均年龄二十到三十岁。

Wǒmen de xuéshēng píngjūn niánlíng èrshí dào sānshí suì.

The average age of our students is between twenty and thirty.

我每天平均做一小时运动。

Wǒ měitiān píngjūn zuò yì xiǎoshí yùndòng.

On average, I exercise for an hour every day.