The mean of seven numbers is 96. If an eighth number is added, the mean becomes 112. Find the eighth number.
-
A.
126 -
B.
180 -
C.
216 -
D.
224
Correct Answer: Option D
Explanation
(frac{x}{7} = frac{96}{1}) ==> (frac{672 + x}{8} = 112)
Therefore x = 224