Q. 234.7( 19 Votes )
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.
We may calculate class marks (xi) for each interval by using the relation
Class size = 0.04
Now taking 0.14 as assumed mean (A), we can calculate as follows:
Mean (x̅) = A + * h
= 0.14 + * (0.04)
= 0.14 – 0.04133
SO, mean concentration of SO2 in the air is 0.099ppm
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