That's not the correct definition of the concept of "weighted average". Instead, it's rather the average product of two data vectors x and w.
I agree with yurenchu. If you want to choose Problems to translate, then first read all comments made about the original Problem statement to see if there are any important critiques to heed. If so, then either address the critiques and create an improved version of the Problem, or else choose a different original Problem.
Changed the translation
Very good :-)
Replace NaNs with the number that appears to its left in the row.
Circular Primes (based on Project Euler, problem 35)
Sum the numbers on the main diagonal
Determine the square root
Replacing a row
NaN (欠損値) が含まれている行を削除しよう
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