Question: There is a logical error in program least_squares_fit from Example 5-5. The error can cause the program to abort with a divide-by-zero error. It slipped

There is a logical error in program least_squares_fit from Example 5-5. The error can cause the program to abort with a divide-by-zero error. It slipped through the example because we did not test the program exhaustively for all possible inputs. Find the error, and rewrite the program to eliminate it.

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