RANDUNIFORM(a,b)
RANDUNIFORM returns a random variate from the uniform (flat) distribution from a to b. The distribution is,
p(x) dx = {1 over (b-a)} dx : for a <= x < b.
p(x) dx = 0 : for x < a or b <= x.
RANDUNIFORM(1.4,4.2) returns a random number greater than or equal to 1.4 but less than 4.2.