Question 50

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waecmaths question: 

The mean of the number 2, 5, 2x and 7 is less or equal to 5. Find the range of values of x

Option A: 

$x\le 3$

Option B: 

$x\ge 3$

Option C: 

$x<3$

Option D: 

$x>3$

waecmaths solution: 

$\begin{align}  & \frac{2+5+2x+7}{4}\le 5 \\ & \frac{14+2x}{4}\le 5 \\ & 14+2x\le 20 \\ & 2x\le 6 \\ & x\le 3 \\\end{align}$

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