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To find out the concentration of \(SO_2\) 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 \(SO_2\) (in ppm) Frequency
\(0.00-0.04\) \(4\)
\(0.04-0.08\) \(9\)
\(0.08-0.12\) \(9\)
\(0.12-0.16\) \(2\)
\(0.16-0.20\) \(4\)
\(20-0.24\) \(2\)
 
Find the mean concentration of \(SO_2\) in the air.
 
Mean \(=\) ppm
 
[Note: Round off the answer to three decimal places and enter the answer]