When a function is given by a table of values, it is sometimes reasonable to fill in gaps by averaging nearby function values.

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Quizplus · Accepted Answer

When a function is given by a table of values, and there are gaps or missing values, it can be reasonable to estimate these gaps by averaging nearby function values, especially if the function is expected to change smoothly between the known points. This method is a simple form of interpolation.

When a Function Is Given by a Table of Values