The average age of 9 students and their teacher is 16 years. The average age of the first four students is 19 years and…

The mean of 50 numbers is 30. Later it was discovered that two entries were wrongly entered as 82 and 13 instead of 28 a…

The average of nine number is 50. The average of first five numbers is 54 and that of the last three numbers is 52. Then…

David obtained 76, 65, 82, 67 and 85 marks (out of 100) in English, mathematics, physics, chemistry and bi…

The average of the first five multiples of 3 is-

3 years age, the average age of a family of 5 members was 17 years. A baby having been born, the average age of the fami…

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…

A batsman makes a score of 84 runs in the 21<sup>st</sup> inning and thus increases his average by 2 runs. H…