The marks (out of 100 ) obtained by a group of students in a science test are 85,76,90,85,39,48,56,95,81 and 75 find the mean marks obtained by the group

The marks obtained in mathematics by 30 students of Class X of a certain school are given in table the below. Find the mean of the marks obtained by the students.

The marks obtained by a student of Class XI in first and second terminal examination are 62 and 48, respectively. Find the minimum marks he should get in the annual examination to have an average of at least 60 marks.

In a class test, the sum of the marks obtained by Ravi in Mathematics and Science is 28. Had he got 3 marks more in Mathematics and 4 marks less in Science, the product of his marks would have been 180. Find his marks in the two subjects.

Arithmetic mean of marks (out of 25) scored by 10 students was 15. One of the student, named Karishma enquired the other 9 students and find the deviations from her marksare noted as-8,-6, -3,-1, 0, 2, 3, 4, 6.Find Karishma’s marks.

Following are the marks obtained by 50 students in a unit test, which is administered for 10 marks. Find the mode of the data.

To receive Grade ‘A’ in a course, one must obtain an average of 90 marks or more in five examinations (each of 100 marks). If Sunita’s marks in first four examinations are 87, 92, 94 and 95, find minimum marks that Sunita must obtain in fifth examination to get grade ‘A’ in the course.

It depends upon the demand of the situation whether we are intersted in finding the acerage marks obtained by the students or the marks obtained by most of the students . What do we find in the first situation ?