NCERT Example - Shift every value by 10 - Tales by Dots and Lines
Question: Data: 8, 3, 10, 13, 4, 6, 7, 7, 8, 8, 5. Find the mean. Then find the mean after adding 10 to every value, without re-adding all numbers.
Answer: Original mean 7; after +10 to each value, mean 17.
Full step-by-step NCERT solution with diagrams on Something by Zero.