What is the formula for the average flow rate when starting flow rate and end flow rate are known?

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Multiple Choice

What is the formula for the average flow rate when starting flow rate and end flow rate are known?

Explanation:
To estimate the average flow rate over a period when you only know the flow at the start and at the end, you use the arithmetic mean of the two values. Add the starting flow rate and the end flow rate, then divide by two. This midpoint represents the typical flow if the change from start to end occurs steadily over the interval. The other options don’t reflect an average: adding gives a total, not an average; multiplying yields a product with different units; subtracting gives the change rather than the average. So the correct formula is (Starting Flow Rate + End Flow Rate) / 2.

To estimate the average flow rate over a period when you only know the flow at the start and at the end, you use the arithmetic mean of the two values. Add the starting flow rate and the end flow rate, then divide by two. This midpoint represents the typical flow if the change from start to end occurs steadily over the interval. The other options don’t reflect an average: adding gives a total, not an average; multiplying yields a product with different units; subtracting gives the change rather than the average. So the correct formula is (Starting Flow Rate + End Flow Rate) / 2.

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