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Q.63 Which of the following assertions are CORRECT?P: Adding 7 to each entry in a list adds 7 to the mean of the listQ: Adding 7 to each entry in a list adds 7 to the standard deviation of the listR: Doubling each entry' in a list doubles the mean of the listS: 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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