Question
Obtain the original frequency distribution from the following frequency distribution:

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| No. of units | Below $200$ | $200 – 300$ | $300 – 400$ | $400 – 500$ | $500$ and above |
| No. of families | $7$ | $13$ | $24$ | $16$ | $10$ |
| No. of flowers | $25$ | $23$ | $21$ | $19$ | $17$ | $15$ | $13$ | $11$ |
| No. of plants | $4$ | $10$ | $18$ | $22$ | $20$ | $8$ | $13$ | $5$ |
|
Marks
|
$0-10$ | $10-20$ | $20-30$ | $30-40$ | $40-50$ | $50-60$ | $60-70$ |
|
No. of students
|
$3$ | $5$ | $12$ | $16$ | $11$ | $5$ | $4$ |
| Sale of notebooks (in dozens) | $30$ | $25$ | $21$ | $20$ | $18$ | $16$ | $15$ | $12$ |
| No. of days | $2$ | $2$ | $7$ | $3$ | $4$ | $7$ | $2$ | $3$ |
| No. of bags | $25 – 29$ | $3 0 – 34$ | $35 – 39$ | $40 – 44$ | $45 – 49$ | $50 – 54$ | $55$ and above |
| No. of days | $9$ | $17$ | $32$ | $24$ | $10$ | $5$ | $3$ |