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

Assessment: JAMB UTME - Mathematics - 1997 Subject: General Mathematics

Question 1 Report

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

Answer Details

mean = 60 + 5x
18 + x
3.5 = 60 + 5x
18 + x
7 = 60 + 5x
2 18 + x

7(18+x) = 2(60+5x)
126 + 7x = 120 + 10x
10x - 7x = 126 - 120
3x = 6
x = 2

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