In general, no. It depends on the statistical distribution for these numbers (see, for example, the Wikipedia article). Do you know what your distribution is?
EDIT: Suppose your distribution is that you are equally likely to have any integer from -9 to 9. That's 19 numbers. The expectation for the random number would be
E = (-9:9)/19
ans =
0
However, if you have a set of numbers like your X that are sampled from this distribution, the mean of these numbers estimates E. In this case,
mean(X)
ans =
0.9231
The estimate is, of course, not exactly equal to the expected value because the sample is random.
