something about the cylinder I DONT KNOW just plz help me and it would help a lot if you show work cuz I really wanna learn about this plz THANK YOU :)

Ms. aniston asked seven students in her class to collect pet food cans for a local animal shelter. the dot plot shows the number of food cans collected by each student. each dot represents one student. what is the median of the data set? a. 6 b. 9 c. 7 d. 8