MATHEMATICS

JAMB 2007 - Question 8

Mathematics 2007 JAMB Past Questions - Question 8: Marks ;34 ;5;6 ;7 ;frequency ; 5 y-1 ; y ; ;94 table above gives the frequency distribution of marks obtained by a group of students in a test.if the total mark scored is 200,calculate the value of y.

Marks ;34 ;5;6 ;7 ;frequency ; 5 y-1 ; y ; ;94 table above gives the frequency distribution of marks obtained by a group of students in a test.if the total mark scored is 200,calculate the value of y.
Marks ;34 ;5;6 ;7 ;frequency ; 5 y-1 ; y ; ;94 table above gives the frequency distribution of marks obtained by a group of students in a test.if the total mark scored is 200,calculate the value of y.
A:
B:
C:
D:
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Correct Answer

C

Explanation

(3 x5) + (4 (y-1) + (5y) + (6x9) + (7x4) + 8 = 20015+ 4y -4 +5y +54 +28 +8 - 2009y + 105 -4 =200, 9y + 101 = 200, 9y = 200 - 1019y = 99 therefore y = 11