I have to recreate this formula for calculating normal distribution in Sage:
http ://ntaj.dreamhosters.com/ti.jpg
The picture is from TI-Nspire CAS.
What I'm doing is:
sage: f=1/(0.1sqrt(2pi)) * e^((-1/2)*((x-4)/0.1))^2
sage: float(integral(f, 3.9, 4.1))
0.8696735925295498
I can't get the expected result 0.682689 that Nspire gives. Can anyone see why?
