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Which of the following assertions are $\text{CORRECT}$?

  • $P$ : 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. $\text{P, Q}$
  2. $\text{Q, R}$
  3. $\text{P, R}$
  4. $\text{R, S}$
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