CDPH Lead Inspector/Assessor California State Practice Exam

Which of the following indicates the mean readings of at least three areas in substrate correction?

1. The highest readings

2. The lowest readings

3. The average of multiple readings

4. The standard deviation of the readings

The correct answer is: The average of multiple readings

The mean readings in substrate correction involve calculating the average of values obtained from multiple areas. This approach provides a representative value that takes into account the variations present in different areas, allowing for a more accurate assessment of any lead hazards present. By averaging at least three readings, it helps to smooth out any anomalies or outliers that might skew the results if one were to only consider the highest or lowest readings. Using the average, or mean, ensures that the assessment reflects a broader perspective of potential lead exposure across the evaluated spaces, which is critical in establishing whether remedial actions are necessary. It is also a standard practice in environmental assessments to incorporate multiple readings to ensure the integrity and reliability of the results. Thus, this method is foundational in lead inspections and assessments within the context of lead hazard evaluation and risk assessment.