1. Observe the following bar graph and answer the related questions:

In which class is the number of students 500?

2. Observe the following bar graph and answer the related questions:

What is the difference between the maximum and the minimum number of students?

3. Observe the following bar graph and answer the related questions:

In how many classes is the number of students are same?

4. Observe the following bar graph and answer the related questions:

What is the difference between the number of students of class VI and class VII?

5. Observe the following bar graph and answer the related questions:

What is the total number of students?

6. Observe the following bar graph and answer the related questions:

What is the ratio of the number of students of class X and class IX?