Question

If each number in a set of ten numbers is increased by $20$, the arithmetic mean (average) of the original ten numbers:

• A. remains the same
• B. is increased by $20$
• C. is increased by $200$
• D. is increased by $10$

Answer 1

The correct option is B is increased by $20$

If each value is increased by a constant then their mean will also increase by the same constant.

Therefore, mean of original ten numbers is increased by 20.