2005
Mathematics
JAMB
The table above shows that the scores of a group of students in a test. If the average score is 3.5, find the value of x
A.
1
B.
2
C.
3
D.
4
Correct Answer: 2
Explanation
mean = (60+5x)/(18+x). 3.5 =(60+5)/(x18+x). 7/2 = (60+5x)/(18+x) 7(18+x) = 2(60+5x) 126 + 7x = 120 + 10x 10x - 7x = 126 - 120 3x = 6 x = 2
mean = (60+5x)/(18+x). 3.5 =(60+5)/(x18+x). 7/2 = (60+5x)/(18+x) 7(18+x) = 2(60+5x) 126 + 7x = 120 + 10x 10x - 7x = 126 - 120 3x = 6 x = 2THIS WEEK's
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