Please help! this assignment is due under 10 minutes! please with explatiation Thank you!

In the final round of trivia competition, contestants were asked to name as many states that begin with the letter m as they could in 15 seconds. the bar graph shows the number of states the contestants were able to name. how many contestants participated in the final round of the competition?

If you could answer these your a life saver

What does independent variable and dependent variable mean in math?