Q. 74.2( 18 Votes )

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Answer :

Let’s find mean of the data using direct method as data given have smaller values.

First, construct a table for ease of calculation.



Mean is given by



Mean = 2.96/30


Mean = 0.0987


Or approximately, mean = 0.099


Thus, mean concentration of SO2 in the air is 0.099 ppm.


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