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Experimental Probability

This frequenc...

Question

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

\frac{3}{20}

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\frac{1}{4}

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\frac{7}{10}

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\frac{9}{20}

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Solution

The correct option is C $\frac{7}{10}$
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) = $\frac{14}{20} = \frac{7}{10}$

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