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
A
3%
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B
12%
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C
15%
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D
30%
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