The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean scor…

Average score of a class of 60 students, in an exam, was 43. Average score of the students who had passed is 52 and the …

A family consists of grandparents, parents and three grandchildren. The average age of the grandparents is 67 years that…

The average marks obtained by 22 candidates in an examination are 45. The average marks of the first ten are 55 and that…

If average of 20 observations x<sub>1</sub>, x<sub>2</sub>, . . . . . x<sub>20</sub>…

The mean monthly salary paid to graduating MBA class of a management institute is Rs. 16000. The mean monthly salary pai…

Out of 10 teachers of a school, on teacher retires and in place of him a new teacher 25 years old joins. As a result of …

In a boat there are 8 men whose average weight is increased by 1 kg when 1 man of 60 kg is replaced by a new man. What i…