Not normalized scores

[davidbnk]

Documentation says

So scoring here is relative - we don't give anything on a score of 0-100. Instead, we give the mean of the student's estimated ability, which should have a mean around 0 and be approximately normally distributed.

But instead I'm getting scores in the 0.6~0.7 range from the generated data:

MARC 0.669053752357
SUN 0.662938552108
DIEDRE 0.721413935888
ANNIKA 0.697763292495
TAINA 0.686418547315

Is this expected?