There are _____ students in a class and Average weight of class is 20 kg. When two new students include in the class average weight becomes 22 kg. After those four students left the class, whose weight half of the weight of two person included previously, then average weight of class becomes 25 kg.

The average of 10 observations is 40. It was realised later that an observation was misread as 31 in place of 50. Find the correct average.​

The average of 10 observations is 40. It was realised later that an observation was misread as 32 in place of 43. Find the correct average.​

The average age of 48 students of a class is 22 years. If the age of the teacher is also included, the average age of the whole group becomes 23 years. The age (in years) of the teacher is:

A batsman makes a score of 79 runs in the 18th inning and thus increases his average by 2. Find his average after 18th inning.

The average score of 7 players was initially recorded as 55. However, it was later discovered that a score of 35 had been mistakenly read as 53. Determine the correct average score.(Rounded up to two decimal places)

The average weight of x students is 62 kg. If two person whose weight are 82.5 and 78.5 left the group and a new person whose weight is 162 kg join the group, then the average becomes 65.5 kg. find x.

The average of 41 numbers is 16. The average of the first 17 numbers is 27 and the average of the last 25 numbers is 26. Ifthe 17th number from the beginning is excluded, then what is the average of the remaining numbers?