the one advanced random demo I looked at said that it produces values between 0 and 1.
so to get a number between 0 and 25, multiply the value by 25.
to get a number between 5 and 15, multiply by 10 and add 5
for 1 to 10, multiply by 9 and add 1.
in general, multiply the value by (upper limit - lower limit) and add the lower limit.