Find the mean concentration of SO2 in the air.

Question

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.

Answer 1

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

= \(\frac{2.96}{30}\)

= 0.00986666……. 

≃ 0.099