Question on: JAMB Mathematics - 2007
(\begin{array}{c|c} Marks & 3 & 4 & 5 & 6 & 7 & 8\
\hline Frequency & 5 & y - 1 & y & 9 & 4 & 1\end{array})
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, the value of y
A
11
B
15
C
9
D
13
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Correct Option: A
(3 x 5) + (4(y - 1)) + (5y) + (6 x 9) + (7 x 4) + 8 = 200
15 + 4y - 4 + 5y + 54 + 28 + 8 = 200
9y + 105 - 4 = 200
9y + 101 = 200
9y = 200 - 101
9y = 99
y = 11
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