To find out the concentration of So, 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: 0.08-0.12 0.12-0.16 0.16-0.20 0.20-0.24 0.00-0.04 0.04-0.08 Concentration of So, in ppm 9 9 2. 4 2 4 Frequency Find the mean concentration of So, in the air.?
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mean concentration of SO2=€fi xi/£fi
= 2.90/30= 0.099
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