l1, l2, and l3 have the following values:
l1 = 14.0 ± 0.05, l2 = 32.0 ± 0.05, l3 = 49.0 ± 0.05
These values are respectively 1/4, 3/4, and 5/4 of the wavelength of a stationary wave. So I have to calculate out the wavelength with some subtraction and multiplication. Hope you understand what I'm trying to do..
So these are the values I calculated:
2(L3-L2) = 34.0 ± 0.2, 2(L2-L1) = 36.0 ± 0.2, L3-L1 = 35.0 ± 0.1
I want to get the average of these values; but I have no idea how to do this when some of the values have different measurement errors.