有一次我生病在家。他家离我家很远，但他放学之后帮忙我学习。罸。

Once I was ill at home. He lived far away from my house but he came and helped me with my study.

平均值：即平均数，将所有数据加起来，除以数据的个数即可得。 罸。

Mean is just the average of the numbers. It is easy to calculate: add up all the numbers, then divide by how many numbers there are.

平均值：即平均数，将所有数据加起来，除以数据的个数即可得。 罸。

Mean is just the average of the numbers. It is easy to calculate: add up all the numbers, then divide by how many numbers there are.