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03/07/2021 11:04 am
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To find out the concentration of SO2 in the air (in parts per million, i.e., ppm), the data was collected for 30 localities in a certain city and is presented below:
Concentration of SO2 ( in ppm) - Frequency
0.00 – 0.04 → 4
0.04 – 0.08 → 9
0.08 – 0.12 → 9
0.12 – 0.16 → 2
0.16 – 0.20 → 4
0.20 – 0.24 → 2
Find the mean concentration of SO2 in the air.
1 Answer
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03/07/2021 11:07 am
To find out the mean, first find the midpoint of the given frequencies as follows:
The formula to find out the mean is
Mean = x̄ = ∑fixi /∑fi
= 2.96/30
= 0.099 ppm
Therefore, the mean concentration of SO2 in air is 0.099 ppm.