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>will i get the mean and sd close to 0 and 1 for all the random numbers...

I don't know exact percentage of accuracy for rand function. It is about 0.xx for the mean and 0.xxx for sd.

Take a look at:

http://www.santafe.edu/projects/swarm/swarmdocs/userbook/swarm.random.sgml.appendix.html

>but how do you get 3.47 and 1.739?

did you know which kind of transformation is y=2*z*f(x)-z?if f(x)={0..1}. --> f(x) = {-z..+z}

f(x) = rand()/RAND_MAX;

By sample: m =0.501 and sd = 0.2884

Then from sd(f(x,z)) = 1, I can find z (1.7337).