nextGaussian
Returns the next pseudorandom, Gaussian ("normally") distributed {@code double} value with mean {@code 0.0} and standard deviation {@code 1.0} from this random number generator's sequence.
The general contract of {@code nextGaussian} is that one {@code double} value, chosen from (approximately) the usual normal distribution with mean {@code 0.0} and standard deviation {@code 1.0}, is pseudorandomly generated and returned.
Return
the next pseudorandom, Gaussian ("normally") distributed {@code double} value with mean {@code 0.0} and standard deviation {@code 1.0} from this random number generator's sequence