Find the change in average weight of 12 students when a person having 84 kg weight is replaced by a person having 54 kg weight.

Keep practicing — related questions

• When a man weighing 75 kg is replaced by another man in a group of 20 persons, the average weight decreases...
• The average marks of 22 students in section A of class 9 are 52, that of 23 students of section B are 50 an...
• A shopkeeper purchased 12 kg of rice at Rs. 720 and sold them at a loss equal to the selling price of 4 kg ...
• The average age of 41 students of a class is 15 years. When one boy leaves the class, the average is reduce...
• The average of 15 numbers is 26.2. If the average of first 8 numbers is 27.875 and the average of last 8 nu...
• The average salary of 25 teachers is Rs. 6050 per month. Five teachers leave the school and the average sal...
• A total of 32 books and 40 copies were purchased for Rs. 6960. If the average price of a book was Rs. 155, ...
• The average age of a family of 9 members is 26 years. If the youngest member of the family is 10 years old,...