How to corret an execution plan that shows wrong number of rows?

Using Oracle 10gR2 RAC (10.2.0.3) on SUSE Linux 9 (x86_64).
I have a partition table that has 5 million rows (5,597,831). However an execution plan against the table show that the table has 10 million rows.
Execution plan:
SELECT STATEMENT ALL_ROWS Cost : 275,751 Bytes : 443 Cardinality : 1
3 HASH GROUP BY Cost : 275,751 Bytes : 443 Cardinality : 1
2 PARTITION RANGE ALL Cost : 275,018 Bytes : 4,430,000,000 Cardinality : *10,000,000* Partition # : 2 Partitions accessed #1 - #6
1 TABLE ACCESS FULL TRACESALES.TRACE_BUSINESS_AREA Cost : 275,018 Bytes : 4,430,000,000 Cardinality : 10,000,000 Partition # : 2 Partitions accessed #1 - #6
Plan hash value: 322783426
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop |
| 0 | SELECT STATEMENT | | 1 | 443 | 275K (2)| 00:55:10 | | |
| 1 | HASH GROUP BY | | 1 | 443 | 275K (2)| 00:55:10 | | |
| 2 | PARTITION RANGE ALL| | 10M| 4224M| 275K (2)| 00:55:01 | 1 | 6 |
| 3 | TABLE ACCESS FULL | TRACE_BUSINESS_AREA | 10M| 4224M| 275K (2)| 00:55:01 | 1 | 6 |
How does one correct the explain plan?
The problem: Queries against the table are taking hours to complete. The problem started when the table was dropped then recreated with a new partition.
I have complete the drop and creation against several tables for several years without problems until now.
I have done the following: Analyzed statistics against the table, flushed buffer cache. Created a materialized view.
However users queries are taking several hours to complete, where before the addition of the partition the queries where taking 5 minutes to complete.
Thanks. BL.

Yes, complete analysis of statistic was complete on indexes and against partitions.
Table creation statement:
CREATE TABLE TRACESALES.TRACE_BUSINESS_AREA
... *(400 columns)*
TABLESPACE "trace_OLAPTS"
PCTUSED 0
PCTFREE 15
INITRANS 1
MAXTRANS 255
STORAGE (
INITIAL 1M
NEXT 1M
MINEXTENTS 1
MAXEXTENTS UNLIMITED
PCTINCREASE 0
BUFFER_POOL KEEP
PARTITION BY RANGE (YEAR)
PARTITION TRACE_06 VALUES LESS THAN ('2007')
NOLOGGING
NOCOMPRESS
TABLESPACE TRACE_2006
PCTFREE 15
INITRANS 1
MAXTRANS 255
STORAGE (
INITIAL 1M
NEXT 1M
MINEXTENTS 1
MAXEXTENTS UNLIMITED
PCTINCREASE 0
BUFFER_POOL DEFAULT
PARTITION TRACE_07 VALUES LESS THAN ('2008')
NOLOGGING
NOCOMPRESS
TABLESPACE TRACE_2007
PCTFREE 15
INITRANS 1
MAXTRANS 255
STORAGE (
INITIAL 1M
NEXT 1M
MINEXTENTS 1
MAXEXTENTS UNLIMITED
PCTINCREASE 0
BUFFER_POOL DEFAULT
PARTITION TRACE_08 VALUES LESS THAN ('2009')
NOLOGGING
NOCOMPRESS
TABLESPACE TRACE_2008
PCTFREE 15
INITRANS 1
MAXTRANS 255
STORAGE (
INITIAL 1M
NEXT 1M
MINEXTENTS 1
MAXEXTENTS UNLIMITED
PCTINCREASE 0
BUFFER_POOL DEFAULT
PARTITION TRACE_09 VALUES LESS THAN ('2010')
NOLOGGING
NOCOMPRESS
TABLESPACE TRACE_2009
PCTFREE 15
INITRANS 1
MAXTRANS 255
STORAGE (
INITIAL 1M
NEXT 1M
MINEXTENTS 1
MAXEXTENTS UNLIMITED
PCTINCREASE 0
BUFFER_POOL DEFAULT
PARTITION TRACE_10 VALUES LESS THAN ('2011')
NOLOGGING
NOCOMPRESS
TABLESPACE TRACE_2010
PCTFREE 15
INITRANS 1
MAXTRANS 255
STORAGE (
INITIAL 1M
NEXT 1M
MINEXTENTS 1
MAXEXTENTS UNLIMITED
PCTINCREASE 0
BUFFER_POOL DEFAULT
PARTITION TRACE_11 VALUES LESS THAN (MAXVALUE)
NOLOGGING
NOCOMPRESS
TABLESPACE TRACE_2011
PCTFREE 15
INITRANS 1
MAXTRANS 255
STORAGE (
INITIAL 1M
NEXT 1M
MINEXTENTS 1
MAXEXTENTS UNLIMITED
PCTINCREASE 0
BUFFER_POOL DEFAULT
NOCOMPRESS
CACHE
PARALLEL ( DEGREE DEFAULT INSTANCES DEFAULT )
MONITORING;
*(index statements, constraints, triggers and security)*
Table caching is on and running in parallel degree 4 instances 1.

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Actually, something does not add up. Left outer join selects all rows in left table even if there is no matching row in right table. Left table in first query is Lookup table. So I can not understand how execution plan:
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| Id | Operation          | Name   | Rows | Bytes | Cost (%CPU)| Time     |
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|   3 |   TABLE ACCESS FULL| Master |     1 |    13 |     2   (0)| 00:00:01 |
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Note
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Statistics
        209 recursive calls
          0 db block gets
         48 consistent gets
          0 physical reads
          0 redo size
        274 bytes sent via SQL*Net to client
        385 bytes received via SQL*Net from client
          1 SQL*Net roundtrips to/from client
          6 sorts (memory)
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SQL> SELECT t1.ID_LU FROM "Master" t1
2 LEFT OUTER JOIN "LookUp" t2
3 ON t1.ID_LU = t2.ID_LU;
no rows selected
Execution Plan
Plan hash value: 3856835961
| Id | Operation          | Name      | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT   |           |     1 |    26 |     2   (0)| 00:00:01 |
|   1 | NESTED LOOPS OUTER|           |     1 |    26 |     2   (0)| 00:00:01 |
|   2 |   TABLE ACCESS FULL| Master    |     1 |    13 |     2   (0)| 00:00:01 |
|* 3 |   INDEX UNIQUE SCAN| LOOKUP_PK |     1 |    13 |     0   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   3 - access("T1"."ID_LU"="T2"."ID_LU"(+))
Note
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Statistics
          1 recursive calls
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          7 consistent gets
          0 physical reads
          0 redo size
        274 bytes sent via SQL*Net to client
        385 bytes received via SQL*Net from client
          1 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
          0 rows processed
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