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This is from oracle docs
EXP-00091: Exporting questionable statistics.
Cause: Export was able export statistics, but the statistics may not be usuable. The
statistics are questionable because one or more of the following happened during
export: a row error occurred, client character set or NCHARSET does not match
with the server, a query clause was specified on export, only certain partitions or
subpartitions were exported, or a fatal error occurred while processing a table.
Action: To export non-questionable statistics, change the client character set or
NCHARSET to match the server, export with no query clause, export complete
tables. If desired, import parameters can be supplied so that only non-questionable
statistics will be imported, and all questionable statistics will be recalculated.
You can be able to import by this export dump as it is successfully exported but the statistics for the objects you exported is not correct as it is in DB.