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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
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