The frequency table shows the marks obtained by a group of students in a monthly test. Calculate the percentage of students who failed the test if 40 is the passing mark.
Marks Number of students
0 - 19 5
20 - 29 7
40 - 59 14
60 - 79 11
80 - 99 3

3 %

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12 %

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15 %

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30 %

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Solution

The correct option is D $30 %$
$M a r k s$ $N u m b e r o f s t u d e n t s$
$0 - 19$ $5$
$20 - 29$ $7$
$40 - 59$ $14$
$60 - 79$ $11$
$80 - 99$ $3$
$40$
Students scored less then 40 is $12 S t u d e n t$
$f a l i u r e$ %= $\frac{12}{40} \times 100$ = $30$ %

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Test	$I$	$I I$	$I I I$	$I V$	$V$
Percentage marks obtained	$69$	$71$	$73$	$69$	$74$

70 %

Marks (Class interval)	Number of students (Frequency)
1−10	7
11−20	10
21−30	6
31−40	4
41−50	3

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