GATE Papers >> Mechanical >> 2012 >> Question No 65

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

• (A)  P, Q   
• (B)  Q, R   
• (C)  P, R   
• (D)  R, S