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Question -

To find out the concentration of S02 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 S02 in the air.



Answer -

Let assumed mean (A) = 0.10
  
= 0.10 – 0.00133 = 0.09867 = 0.099 (approx)

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