该群体的平均年龄是20岁。
The ___average age of the group is 20 years.
这座山上的天气非常好,平均温度为17摄氏度。
The weather on this mountain is fantastic, with an ___average temperature of 17°C.
通过求和并除以数量来计算平均值。
Calculate the ___average by summing the numbers and dividing by the count.