Average weight of 25 persons is increased by 1 kg when one person weighing 60 kg is replaced by a new person. Weight of …

The average of 9 observations was found to be 35. Later on, it was detected that an observation 81 was misread as 18. Th…

The average of 80 boys in a class is 15. The average age of a group of 15 boys in the class is 16 and the average age of…

Average of ten positive numbers is x. If each number is increased by 10%, then x :

The average age of a family of 10 members is 20 years. If the age of the youngest member of the family is 10 years, then…

The average of X<sub>1</sub>, X<sub>2</sub> and X<sub>3</sub> is 14. Twice the sum o…

The mean high temperature of the first four days of a week is 25°C whereas the mean of the last four days is 25.5&de…

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…