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| Marks $(x_{i})$ | $15$ | $22$ | $28$ | $31$ | $35$ | $40$ | $44$ | $46$ |
| Number of students $(f_{i})$ | $2$ | $3$ | $5$ | $6$ | $6$ | $4$ | $3$ | $1$ |
| Obtained marks | No. of Students |
| $0$ or more than $0$ | $50$ |
| $20$ or more than $20$ | $48$ |
| $40$ or more than $40$ | $40$ |
| $60$ or more than $60$ | $31$ |
| $80$ or more than $80$ | $10$ |
| Floor | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ |
| Number of employees | $51$ | $48$ | $42$ | $44$ | $48$ | $32$ |
| Frequency $(f_i)$ | Variable $(x_i)$ |
| $4$ | $4$ |
| $8$ | $6$ |
| $14$ | $8$ |
| $11$ | $10$ |
| $3$ | $12$ |
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