Below is the histogram depicting marks obtained by 43 students of a class: Write the number of students getting the highest marks. What is the class size?          Figure:

The table shows the marks obtained by 25 students in a class test. Find the mean of the marks obtained

Marks obtained by 100 students of a class are given below. Find out range and coefficient of range of the marks.

The teacher tells the class that the highest marks obtained by a student in her class is twice the lowest marks plus 7. The highest mark is 97. What is the lowest mark?

The data below shows the number of students in class A having secured different marks. What is the mean marks of class A?

The average marks obtained by 45 students in a class is 80. The difference between the marks of the student who got the highest mark and the student who got the least mark is 99. If both these students are not considered, the average of the class falls by 1 mark. Find the highest mark.