hi

I donīt have the time go through them all, but the second question for example. Assuming normal distribution for the weights, with mean 25kg and standard deviation 4.35.

Create new variable Z, with mean

And .

So Z has a mean of 2000, with standard deviation 38.9.

That is, about 4.5 percent.

3)

For confidence interval, look at a post I did recently in this forum.