newbie question-probably an easy answer!

[bazcor]

Hello and thanks for reading this, I've been playing around with
scilab,(nothing very deep,just starting out).

The problem I have that needs explanation is this
:-
-->a=[2,3,4,5,5];
-->b=[2,3,4,5]
-->fre=[1,1,1,2]
-->variance(a) ans= 1.7 //ok here
-->variancef(b,fre) ans= 1.7 // also ok
-->stdev(a) ans = 1.3038405 //good to here
-->stdevf(b,fre) ans = 0 //?? thought it should be the above answer!

I'll just bet there's a easy answer to this, but I'm stumped. Any comment
gratefully received.

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