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)
 Frequency
 











Find the mean concentration of in the air.

Solution:

Calculating mean, we get
Mean,
Here,

Therefore, Mean, ppm

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