Question 34

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Jambmaths question: 

The scores of ten students in a mathematics test with an average score of 10 are 12, 15, 3, 4, 2x, 8, 10, 13, x and 17. Calculate the value of x

Option A: 

10

Option B: 

9

Option C: 

7

Option D: 

6

Jamb Maths Solution: 

$\begin{align}  & mean=\frac{\sum fx}{f} \\ & 10=\frac{12+15+3+4+2x+8+10+13+x+17}{10} \\ & 100=82+3x \\ & x=6 \\\end{align}$

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