Domain is a set of real numbers which is independent
and
Range is a set of real numbers which is dependent with the domain.
From the given problem, We have two factors, the age of a person
and the number of book read.
We can say that the numbers of books read is dependent on the age of a person.
So the domain would be the age
and the range will be the number of books read.
From the table :
Age : 65, 36, 29, 29
Books Read : 42, 37, 37, 17
Remember that in listing the domain and range, there must be NO duplicates
So the domain is : 29, 36, 65
and
the range is : 17, 37, 42
The correct answer is Choice D.