in Quantitative Aptitude retagged by
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Which of the following assertions are $\textbf{CORRECT}$?

  • $P:$ Adding $7$ to each entry in a list adds $7$ to 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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