GAUSS(<real expression>, <real expression> / <,stream> /);Returns a REAL value of a random variable whose probability function is a normal function in which only the positive values are considered. The mean is equal to the first <real expression> and the standard deviation equal to the second <real expression>, computed with random numbers taken from the stream indicated by <stream>. This is an integer from 1 to 10. If omitted, 1 is assumed.