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SAT Math Practice Question #37880 - SATify | SATify

#37880

quantities

arithmetic

statistics

data analysis

average

arithmetic mean

hard

90 sec

Calculator OK

The mean of $n$ numbers is $M$ . If the number $x$ is added to this set of $n$ numbers, the new mean of the $n + 1$ numbers is $M^{'}$ . Which of the following expressions represents $x$ in terms of $n, M,$ and $M^{'}$ ?

A.

$M^{'} (n + 1) - M n$

B.

$M^{'} (n) - M n$

C.

$M^{'} (n + 1) + M n$

D.

$M^{'} (n) + M n$