| वर्ग | $0-10$ | $10-20$ | $20-30$ | $30-40$ |
| आवृत्ति | $1$ | $3$ | $4$ | $2$ |
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| आकार $(x_i)$ | $3.5$ | $4.5$ | $5.5$ | $6.5$ | $7.5$ | $8.5$ | $9.5$ |
| आवृत्ति $(f_i)$ | $3$ | $7$ | $22$ | $60$ | $85$ | $32$ | $8$ |
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