Table Fragmentation

I have a table where there is always a large percentage of updating on the table. And the change of row size is from approx 50bytes to 2000 bytes.

So I need to check that the values PCTFREE and PCTUSED are optimal.

The question is:

1) how can I check if there are chained blocks?
2) Is there a way to check if these values are optimal?
3)any suggestions for an optimal setting?

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