I have numerous data sets of different length/intervals imported from Excel and am attempting to interpolate each one.

After interpolation, I want to find the average of the data sets so I may plot them along with their standard deviations. My attempts to do this so far has failed, as my interpolation function appears to be giving extremely inaccurate results. Does anyone have an idea as to how I can go about this?

Interpolation is not required, but I do need to figure out how to find the average/standard deviations of my various lists.

I've attached a sample set of data to help explain my issue.

Thank you all!