What is the formula to determine the average depth based on readings?

The answer regarding determining the average depth based on readings is that the number of readings or data points, which in this case is represented as "30 readings," provides the basis for calculating an average. In aquatic pest control and other environmental assessments, calculating averages often involves collecting multiple measurements to ensure accuracy and reliability.

To find the average depth, one needs to sum the measured depths and then divide that total by the number of readings taken. This statistical approach helps minimize the impact of any outliers or anomalies in individual readings and reflects a more accurate depiction of the water body’s average depth.

The other choices involve concepts or formulas that relate more to flow rates or specific calculations not directly associated with average depth determination. For instance, CFS (Cubic Feet per Second) is a measurement of flow rate, not depth, and involving calculations like velocity or specific numerical constants wouldn't provide the needed average depth when focused solely on depth readings. Thus, utilizing a straightforward count of readings is a fundamental technique in ensuring the result is valid and comprehensive.