Consider the following statements: 1. ...

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?

1, 2 and 3

1 and 2 only

1 and 3 only

2 and 3 only

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