In a Mathematics test, the following marks were obtained by 40 students. Arrange these marks in a table using tally marks.
(a) Find how many students obtained marks equal to or more than $ 7 . $
(b) How many students obtained marks below 4?"
To do:
We have to find
(a) The number of students who obtained marks equal to or more than \( 7 . \)
(b) The number of students who obtained marks below 4.
Solution:
| Marks | Tally Marks | Number of students |
| 1 | || | 2 |
| 2 | ||| | 3 |
| 3 | ||| | 3 |
| 4 | |||| ||
| 7 |
| 5 | |||| |
| 6 |
| 6 | |||| ||
| 7 |
| 7 | ||||
| 5 |
| 8 | |||| | 4 |
| 9 | ||| | 3 |
(a) The number of students who obtained marks equal to or more than $7=$ The number of students who obtained 7 marks $+$ The number of students who obtained 8 marks $+$ The number of students who obtained 9 marks
$=5+4+3$
$=12$
(b) The number of students who obtained marks below $4=$ The number of students who obtained 3 marks $+$ The number of students who obtained 2 marks $+$ The number of students who obtained 1 mark
$=2+3+3$
$=8$
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