Question: If you were to transform the NULL values into zero in an excel sheet while calculating the averages, what would happen to the average. Will

If you were to transform the NULL values into zero in an excel sheet while calculating the averages, what would happen to the average. Will it be remain same, increase or decrease? How would that change in average affect the way you interpret the data, say SAT scores average of students? Is it a good idea to replace NULL values with zeros in this case?

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