Multiple choice

Which of the following assertions are CORRECT? P: Adding 7 to each entry in a list adds 7 to the mean of the list Q: Adding 7 to each entry in a list adds 7 to the standard deviation of the list R: Doubling each entry in a list doubles the mean of the list S: Doubling each entry in a list leaves the standard deviation of the list unchanged

  1. P, Q

  2. Q, R

  3. P, R

  4. R, S
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Adding a constant to each entry shifts the mean by that constant but does not change the standard deviation. Doubling each entry doubles the mean and doubles the standard deviation. Thus, P and R are correct.

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