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 0.00-0.04 0.04-0.08 0.08-0.12 0.12-0.16 0.16-0.20 0.20-0.24Frequency 4 9 9 2 4 2Find the mean concentration of SO₂ in the air.
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Answer:
mean concentration of SO₂ in the air. 0.0987
Step-by-step explanation:
Concentration Mean Frequency Mean * Frequency
0.00-0.04 0.02 4 0.08
0.04-0.08 0.06 9 0.54
0.08-0.12 0.10 9 0.90
0.12-0.16 0.14 2 0.28
0.16-0.20 0.18 4 0.72
0.20-0.24 0.22 2 0.44
Total 30 2.96
Mean = 2.96/30 = 0.0987
mean concentration of SO₂ in the air. 0.0987
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