Question
What is the necessity of classification in statistical study ?
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No. of TV sets
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$10-30$ | $30-50$ | $50-70$ | $70-90$ | $90-110$ |
| No. of months | $1$ | $4$ | $6$ | $4$ | $1$ |
| No. of ball bearings | $2$ | $4$ | $6$ | $8$ | $10$ | $12$ | $14$ | $16$ |
| No. of machines | $2$ | $2$ | $4$ | $5$ | $3$ | $2$ | $1$ | $1$ |