JAMB Mathematics 2007 Objective — Question 41

Question 41 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2007 Objective paper, with the correct answer and a full explanation.

Mark: 3,4,5,6,7,8; Frequency: 5,y-1,y,9,4,1. The 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. 9
B. 11Correct
C. 13
D. 15

Explanation

Total mark = sum of (frequency x mark) = 3(5)+4(y-1)+5(y)+6(9)+7(4)+8(1) = 9y+101 = 200, giving y=11.

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