MATHEMATICS

JAMB 2015 - Question 34

Mathematics 2015 JAMB Past Questions - Question 34: 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.

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.
A:
B:
C:
D:
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Correct Answer

D

Explanation

The sum of all the scores is the average score multiplied by the number of students:Sum of scores=Average score×Number of studentsSum of scores=Average score×Number of studentsSo,10×10=10010×10=100Now, we add up all the given scores and the unknown x:12+15+3+4+2x+8+10+13+x+17=100Now, let's simplify this equation:(12+15+3+4+8+10+13+17)+(2x+x)=100(82)+(3x)=1003x=100−823x=18Dividing both sides by 3 to solve for x:x=18/ 3 ?=6So, the value of x is 6.