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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]
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