This frequency table shows the results of a small class quiz If a student is selected at random the probability that he or she scored 2, 4 or 5 is
Marks
Frequency
1
4
2
3
3
2
4
6
5
5
A
320
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B
14
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C
710
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D
920
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Solution
The correct option is C710 Total number of students in the class = 4 + 3 + 2 + 6 + 5 = 20 Number of students scoring 2, 4 or 5 = 3 + 6 + 5 = 14 ∴ P(2, 4 or 5) = 1420=710