To find out the concentration of SO_2 in the air (in parts per mil | Filo
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To find out the concentration of in the air (in parts per million, i.e., ppm), the data was collected for localities in a certain city and is presented below:

Concentration of (in ppm)

Find the mean concentration of in the air.


Calculating mean, we get

Therefore, Mean, ppm

We have used direct method because numerical values of and are small.
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