in common/src/main/java/org/apache/flink/training/exercises/common/utils/DataGenerator.java [166:173]
private float aFloat(long seed, float min, float max, float mean, float stddev) {
Random rnd = new Random(seed);
float value;
do {
value = (float) (stddev * rnd.nextGaussian()) + mean;
} while ((value < min) || (value > max));
return value;
}