Function rnorm

rnorm(mean?: number, stdev?: number): number
Generate a normally-distributed floating-point number.
Parameters
- mean: number = 0
  The mean of the population distribution
- stdev: number = 1
  The standard deviation of the population
Returns number
A random float
Example
```
const y = SMath.rnorm(2, 3); // 1.627...
```