Question

The standard deviation of 25 numbers is 40. If each of the numbers is increased by 5, then the new standard deviation will be

• A. 40
• B. 45
• C. $40 + \frac{21}{25}$
• D. None of these

Answer 1

Answer: (A)

40

Answer 2

If each item of a data is increased or decreased by the same constant, the standard deviation of the data remains unchanged.