Marks No. of students
$1 - 20$ $8$
$21 - 40$ $12$
$41 - 50$ $15$
$51 - 60$ $20$
$61 - 70$ $13$
$71 - 80$ $17$
$81 - 90$ $5$
find probability that
A student obtained more than $50$

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Solution

The total no.of students is $8 + 12 + 15 + 20 + 13 + 17 + 5 = 90$
No.of students more than $50$ is $20 + 13 + 17 + 5 = 55$
The probability is $\frac{55}{90} = \frac{11}{18}$

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