ABSTRACT
The following are ambient particulate concentrations (μg/m3) during the first 4 months of operation in a nanolaboratory.
22 17 6 10 5 13 12 16 21
Calculate the following quantities2:
1. Mean 2. Median 3. Mode 4. Range 5. Standard deviation 6. Variance
Solution
1.The mean
X x
n
i =
= + + + + + + + +
=
å 22 17 6 10 5 13 12 16 21
9 13 55 3. /mg m
2.The middle value is 13 mg/m3.
