Originally Posted by

**sm9999** Dear Everyone,

I have two questions and I will start with the tough one,

Assume I have a random variable y with mean and std Uy and Sy

Now the std of y Sy is equal to:

Sy = F(L) a function of another random variable L

Now the L variable is given as samples (sample readings)

how can I find Sy in terms of SL (given that SL is std for L)

The second question is do you happen to know a good and easy probability and statistics book the cover this issue with applications in engineering?

thank you

sm