waecmaths question:
The mean of 1, 3, 5, 7 and x is 4. Find the value of x
Option A:
2
Option B:
4
Option C:
6
Option D:
8
waecmaths solution:
$\begin{align} & \bar{x}=4 \\ & \frac{1+3+5+7+x}{5}=4 \\ & 16+x=20 \\ & x=4 \\\end{align}$
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