Question

A pipet delivers 10.4ml, 10.8ml, 10.2ml, and 10.6ml in consecutive trials. Find the mean volume and the average deviation from the mean.

A. Mean: 10.5ml; Deviation: 0.15ml
B. Mean: 10.5ml; Deviation: 0.2ml
C. Mean: 10.4ml; Deviation: 0.2ml
D. Mean: 10.4ml; Deviation: 0.15ml

Answer 1

The mean volume is 10.5 mL and the average deviation from the mean is 0.2 mL. So, the correct answer is option b.

Step-by-step explanation:

To find the mean volume, you add up all the volumes and divide by the number of trials. In this case, the sum of the volumes is 10.4 + 10.8 + 10.2 + 10.6 = 42 mL. Since there are four trials, the mean volume is 42 mL / 4 = 10.5 mL.

To find the average deviation from the mean, you subtract the mean volume from each individual volume, take the absolute value, and then find the average of those deviations. In this case, the deviations from the mean are 10.4 - 10.5 = 0.1 mL, 10.8 - 10.5 = 0.3 mL, 10.2 - 10.5 = 0.3 mL, and 10.6 - 10.5 = 0.1 mL. The average of these deviations is (0.1 + 0.3 + 0.3 + 0.1) / 4 = 0.2 mL. So, the correct answer is option b.