Answer:
This is a statistical question
Explanation:
A statistical question gives you an answer that just contains one number.
Example of statistical question: How old are you?
Since this question can be answered without varying data, this is a non-statistical question.
Example of statistical question: How old are the students in your school?
Since this question requires a lot of varying data, this is a statistical question.
So finally, in your case, "How heavy are elephants?", this is a statisical question because it is asking about more than 1 elephant.