Consider the following statements: 1. If 10 is added to each entry on a list then the average increase by 10 . 2. If 10 is added to each entry on a list, then the standard deviation increase by 10 . 3. If each entry on a list is doubled, then the average doubles. Which of the above statement are correct?

• A

  1,2 and 3
• B

  1 and 2 only
• Correct answer
  C

  1 and 3 only
• D

  2 and 3 only

Hence, the correct answer is option: 'C'.