Wallace, Gerry, and Burr all saw improvement, as the bars representing their 2013 median scores are longer than the ones for 2012. A visual inspection shows that the greatest difference is between the two bars representing Wallace High, so Wallace is the correct choice.

Let's look at the bar graph.

The bottom of the bar graph lists the different classes. The height of each bar displays a quantity that matches up with the scale on the left side. This quantity represents the number of students in that class.

You can either use the left scale to determine the number of students, or you can see the quantities posted on each bar.

So, we will find the bar that corresponds to Art class. We can see it is the 3rd class listed. Now, we can see that bar goes up to 21.

Therefore, the number of students in Art class is 21.

Let's look at the bar graph.

We can see the months are listed along the bottom axis. We can also see the scale on the left ranges from 0 to 25. These numbers represent the number of enrollments.

Now, to find the approximate number of enrollments for April, we will first find April. We can see it is the last month listed.

Now, we can see the value of the bar is between 20 and 25. We can also see that it is fairly close to 20. 

Therefore, we can approximate the number of enrollments for April is 21.

Let's look at the bar graph.

We can see the different pizza toppings on listed on the bottom. We can also see the number of people who like a specific pizza topping is shown on the bar.

Now, we want to find how many more people like cheese than pepperoni. To d that, we need to find the difference of those who like cheese and those who like pepperoni.

So, we can see cheese is the last topping listed. It shows 48 people. We can see pepperoni is the first topping listed. It shows 26 people like it.

Now, we will find the difference. We get

Therefore, 22 more people like cheese than pepperoni.

Let's look at the bar graph

To find the number of students in the largest class, we will essentially be looking at the class with the most students (or the class with the tallest bar).

We can see the class with the tallest bar is Art. We can see it has 31 students.

Therefore, the largest class has 31 students.

Let's look at the graph:

We can see the bars represent the number of enrollments in the 12th grade for different years.

To find the difference of enrollments from 2012 to 2015, we will first find the number of enrollments from those years, then we will subtract them.

So, we can see the number of enrollments in 2012 was 89. We can see the number of enrollments in 2015 was 148. Now, we subtract. We get

Therefore, the difference of 12th grade enrollments from 2012 to 2015 is 59.

Let's look at the graph. 

To find the year with the most enrollments, we will find the year that has the tallest bar.

We can see the tallest bar shows 152 enrollments. It corresponds to the year 2016.

Therefore, the year with the most enrollments is 2016.

From the graph, we can see that  students do not have any pets.

We can see that  students have just one pet. From these students, the class has  pets.

Next, notice that  students have  pets. From these students, the class has  pets.

Next,  students have  pets. From these students, the class has  pets.

Then,  students have  pets. From these students, the class has  pets.

Finally,  students have  pets. From these students, the class has  pets. 

To find the total number of pets owned by the students, add these values together:

Recall how to find the average of a set of numbers:

Start by finding the total number of pets that the students in the class own.

From the graph, we can see that  students do not have any pets.

We can see that  students have just one pet. From these students, the class has  pets.

Next, notice that  students have  pets. From these students, the class has  pets.

Next,  students have  pets. From these students, the class has  pets.

Then,  students have  pets. From these students, the class has  pets.

Finally,  students have  pets. From these students, the class has  pets. 

To find the total number of pets owned by the students, add these values together:

Since we know that there are  students, we can then find the average:

Recall that the mode in a set of data is the number that is repeated most often. For this question, this means that the mode number of pets owned will be the number that correlates to the most number of students. Since  students do not own any pets,  pets must be the mode.