Server Administration :: Privilege Require To Gather Stats?

what privilege is required to run dbms_stats package for gathering table and schema statistics.

SQL> show user
USER is "JACK"
SQL>
SQL> select * from user_sys_privs;

no rows selected

SQL> select * from user_role_privs;

no rows selected

SQL> select * from role_sys_privs;

no rows selected

SQL> exec dbms_stats.gather_table_stats('JACK','EN1')

PL/SQL procedure successfully completed.

I revoke all the privileges from JACK user but still i am able to gather stats for a table.what privilege is require to gather stats.