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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: 

Find the mean concentration of SO2 in the air.

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∴ \(\overline{x}=\frac{\Sigma f_ix_i}{\Sigma f_i}\)

\(\frac{2.96}{30}\)

= 0.00986666……. 

≃ 0.099

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