| चर $(x)$ | $x_{1}$ | $x_{2}$ | $x_{3} \ldots x_{15}$ |
| आवृत्ति $(f)$ | $f_{1}$ | $f_{2}$ | $f_{3} \ldots f_{15}$ |
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| वर्ग | $0-10$ | $10-20$ | $20-30$ | $30-40$ | $40-50$ |
| आवृत्ति | $2$ | $3$ | $x$ | $5$ | $4$ |
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