The mean of 25 observations was found to be 78.4. But later on it was found that 96 were misread as 69. The correct mean…

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 1<sup>2</sup>, 2<sup>2</sup>, 3<sup>2</sup>, 4<sup>2</sup>, …

The average age of four boys A, B, C and D is 5 years and the average age A, B, D, E is 6 years. C is 8 years old. The a…

There are three positive numbers. One third of the average of all the three numbers is 8 less than the value of the high…

The average of 25 observations is 13. It was later found that an observation 73 was wrongly entered as 48. The new avera…

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

The average of n numbers x<sub>1</sub>, x<sub>2</sub>.....x<sub>n</sub> is $$\overli…