@Override
    public Distribution initialize(final int invocations, final int expectedTotal) {
        double mean = (expectedTotal * 1.0) / invocations; //TODO: account for truncated gaussian distribution
        return new NormalDistribution(stdDeviation, mean);
    }
Constructs a NormalDistribution with the given standard deviation.
<p/>
Setting the standard deviation to 0 makes this a constant distribution.

@param stdDeviation Simple deviation of the distribution. Must be non-negative.
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/algorithm/generator/NormalDistribution.java