In a class test in mathematics, 10 students scored 75 marks, 12 students scored 60 marks, 8 students scored 40 marks and 3 students scored 30 marks. Find the mean of their score.

In a class of 50 students, each of the students passed either in mathematics or in a science or in both 10 students passed in both and 28 passed in science. Find how many students passed in mathematics only.

The following pie chart gives the marks scored in an examination by a student in various subjects . If the total marks obtained by the student were 360 , answer the questions. Find the marks obtained in each subject.

Find the mean of the marks obtained by 30 students of class IX of a school. The marks are