I know,

I know the rule:

If x & y are independent:

E(xy)=E(x)·E(y)

σxy^2= μx^2·σy^2 + μy^2·σx^2 + σx^2·σy^2

Here we have 3 variables, and "a" depends on ΔT

I did this:

Total mean = (10+0.1·15)·10^-6 · 6 · 15

but I think it is totally incorrect

"Total σ" seems to be even more difficult