the average of和 a average of 有区别吗

the average of 是指具体的某事物的平均数,
an average of是泛指某个平均数,不是特指的
例如, the average of our wage is not very high
we have many books and we have an average of 35 books per person

an average of 不是a average of

the average of 是指具体的某事物的平均数, an average of是泛指某个平均数,不是特指的

基本一样，差别是具体与泛指。