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) $\mathrm{Q}, \mathrm{R}$

(C) $\mathrm{P}, \mathrm{R}$

(D) $\mathrm{R}, \mathrm{S}$

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) $\mathrm{Q}, \mathrm{R}$

(C) $\mathrm{P}, \mathrm{R}$

(D) $\mathrm{R}, \mathrm{S}$

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