Jambmaths question:
If the mean of 4, y, 8 and 10 is 7. Find y
Option A:
6
Option B:
10
Option C:
7
Option D:
9
Jamb Maths Solution:
$\begin{align} & \bar{x}=\frac{4+y+8+10}{4}=7 \\ & 22+y=28 \\ & y=6 \\\end{align}$
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