Your question is Satellite Mean and Median With Expensive Reads. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
If there are 10 satellites and you want the combined mean of the data they collected, what data would you ask for given that retrieving data from any satellite is expensive? What would you ask for to compute the combined median?