Question

In an environmental studies lab, a technician is analyzing water from the local river. She is measuring the pesticide concentration in the water. She analyzes the sample 3 ×, and the pesticide concentration measurements are 0.02 mg/ml, 0.09 mg/ml, and 0.09 mg/ml. What was the average of the three measurements? Round your answer to the nearest thousandth.

A. 0.053mg/ml
B. 0.067mg/ml
C. 0.093mg/ml
D. 0.100mg/ml

Answer 1

The average of the three pesticide concentration measurements is 0.067 mg/ml after rounding to the nearest thousandth, corresponding to option B.

Step-by-step explanation:

To calculate the average of the three pesticide concentration measurements, we add the measurements together and then divide by the number of measurements. Here is the calculation:

(0.02 mg/ml + 0.09 mg/ml + 0.09 mg/ml) / 3 = 0.20 mg/ml / 3 = 0.0667 mg/ml

When rounding to the nearest thousandth, the average pesticide concentration measurement is 0.067 mg/ml, which corresponds to option B.