CPU stats discrepancy

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Can someone explain the output from 'top' below? There is only one
process that eats 50% of one CPU but both CPUs appear busy with
something...
 
We are talking about Dual Xeon 1.5G computer

Additional info:
math10-lx:~->1% cat /etc/redhat-release
Red Hat Enterprise Linux AS release 3 (Taroon Update 1)
math10-lx:~->2% uname -a
Linux math10-lx 2.4.21-9.ELsmp #1 SMP Thu Jan 8 17:08:56 EST 2004 i686
i686 i386 GNU/Linux
math10-lx:~->3% free -m
             total       used       free     shared    buffers     cached
Mem:          2013       1638        374          0        180        548
-/+ buffers/cache:        910       1102
Swap:         1984       1091        892
math10-lx:~->4% top

16:32:44  up 137 days, 55 min, 13 users,  load average: 1.71, 1.68, 1.68
103 processes: 102 sleeping, 1 running, 0 zombie, 0 stopped
CPU states:  cpu    user    nice  system    irq  softirq  iowait    idle
           total   76.7%    0.0%   16.3%   0.0%     0.0%    0.0%    6.7%
           cpu00   81.0%    0.0%   14.1%   0.1%     0.0%    0.0%    4.5%
           cpu01   72.5%    0.0%   18.5%   0.0%     0.0%    0.0%    8.9%
Mem:  2061612k av, 1673672k used,  387940k free,       0k shrd,  184476k buff
                   1168060k actv,   71124k in_d,   20796k in_c
Swap: 2032212k av, 1117800k used,  914412k free                  561440k cached

  PID USER     PRI  NI  SIZE  RSS SHARE STAT %CPU %MEM   TIME CPU COMMAND
 3877 ital      16   0  410M 410M 11148 S    49.9 20.3 300:10   0 java
 7287 marinao   15   0  156M  37M 20464 S     0.1  1.8  1125m   0 matlab
 6792 root      15   0  1104 1104   748 R     0.1  0.0   0:00   1 top
    1 root      15   0   492  464   436 S     0.0  0.0   2:39   1 init
    2 root      RT   0     0    0     0 SW    0.0  0.0   0:00   0 migration/0
    3 root      RT   0     0    0     0 SW    0.0  0.0   0:00   1 migration/1


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