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…

The average of the first 100 positive integers is -

The average age of the mother and her six children is 12 years which is reduced by 5 years if the age of the mother is e…

16 children are to be divided into two groups A and B of 10 and 6 children. The average percent marks obtained by the ch…

Average age of 6 sons of a family is 8 years. Average age of sons together with their parents is 22 years. If the father…

A library has an average of 510 visitors on Sundays and 240 on other days. What is the average number of visitors per da…

If a, b, c, d, e are five consecutive odd numbers, their average is :

The average age of a class of 39 students is 15 years. If the age of the teacher is included, then the average increases…