Questions on numbers and marks of classes

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

A test has 150 questions. A candidate gets 2 marks for each correct answer and loses 1 mark for each wrong answer and loses (1)/(2) mark for leaving the question unattempted. A student score 165 marks. If the student left 18 questions unattempted, find the number of questions he marked wrong.

CBSE Class 10 Maths | Most Important Questions For 4 Marks | Most Expected Questions | CBSE Board

The following graph shows the number of boys and girls in Class V, Class VI, Class VII and Class VIII. Study the graph and answer the question. What class has the maximum number of students?

The following graph shows the number of boys and girls in Class V, Class VI, Class VII and Class VIII. Study the graph and answer the question. What is the average number of girls in all the classes?