Question
The table given below shows the marks obtained by $30$ students in a test.
Out of these students, one is chosen at random. What is the probability that the marks of the chosen student:
$i.$ Are $30$ or less?
$ii.$ Are $31$ or more?
$iii.$ Lie in the interval $21 - 30$?
| Marks $($Class interval$)$ |
$1 - 10$ | $11 - 20$ | $21 - 30$ | $31 - 40$ | $41 - 50$ |
| Number of students $($Frequency$)$ |
$7$ | $10$ | $6$ | $4$ | $3$ |
$i.$ Are $30$ or less?
$ii.$ Are $31$ or more?
$iii.$ Lie in the interval $21 - 30$?
