MATHEMATICS

JAMB 2005 - Question 44

Mathematics 2005 JAMB Past Questions - Question 44: scores ;;2 3 ; 4; 5 lt;div>no of student ; 1 ; 4 ;5 x ;The table above shows the scores of a group of students in a test.if the average score is 3.5,find the value of x.

Choose the most appropriate option for the gap .
scores ;;2 3 ; 4; 5 lt;div>no of student ; 1 ; 4 ;5 x ;The table above shows the scores of a group of students in a test.if the average score is 3.5,find the value of x.
scores ;;2 3 ; 4; 5 lt;div>no of student ; 1 ; 4 ;5 x ;The table above shows the scores of a group of students in a test.if the average score is 3.5,find the value of x.
A:
B:
C:
D:
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Correct Answer

B

Explanation

x (mean) = Efx/ Ef 3.5= 60+5x / 18+x3.5(18+x) = 60 + 5 x 63 +3.5x = 60+5x63-60=5x-3.5x3= 1.5x, 3 / 1.5 = 2