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
Verified Correct Answer: D.
Step-by-Step Mathematical Solution
\(\frac{x}{7} = \frac{96}{1}\) ==> \(\frac{672 + x}{8} = 112\)
Therefore x = 224
Source: Myschool Past Questions Archive (Record #27344)