this subject is not in my book and i don't know how to do it and i need the answer!!! help

Two math teachers surveyed students on the number of hours they spend during the school week on the internet compared to the number of chores they are responsible for. The scatter plots below show the results of the survey.

graphs :
http://stellalikeyoucare.tumblr.com/

What is the difference in the ranges of the chores for between the two classes?
i think it might be eight but im soo lost!!!

A. 8

B. 1

C. 17

D. 9

Question

this subject is not in my book and i don't know how to do it and i need the answer!!! help
 

Two math teachers surveyed students on the number of hours they spend during the school week on the internet compared to the number of chores they are responsible for. The scatter plots below show the results of the survey.
 
graphs :
 http://stellalikeyoucare.tumblr.com/
 
What is the difference in the ranges of the chores for between the two classes? 
i think it might be eight but im soo lost!!!
 
A. 8 

B. 1 

C. 17 

D. 9

anonymous · Answer

B

anonymous · Answer

You wanna know why??

phi · Answer

Range is highest minus the lowest

phi · Answer

Find the range for the two classes
then find the difference between the two ranges.

anonymous · Answer

Phi is right so you do 9-8 = 1 and 10 - 9 = 1 there is the same range 1 in each of these so the answer is B. 1