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

Correct option is C

(a) True: Adding a constant increases the mean by the same value.
(b) False: Adding a constant does not affect the standard deviation, as it measures dispersion.
(c) True: Doubling each value also doubles the mean.