Atrainer takes a survey of all the athletes in a school about their height, rounded to the nearest inch, and their grade level. the trainer relates their grade levels to their heights. is this a function?

No.

Step-by-step explanation:

We have been given that a trainer takes a survey of all the athletes in a school about their height, rounded to the nearest inch, and their grade level. The trainer relates their grade levels to their heights.

Since we know that a function gives exactly one output for a given input.

Let us see that this relationship is a function or not.

We can see that this is not a function because there can be students from different grades with same height. So we can see that one input produces multiple outputs, therefore, this is not a function.