# 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

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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:

Find the mean concentration of SO_(2) in the air.

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We have (assumed mean) a=0.10 (class width) h=0.04,
(total observation. ) N=30 and sum f_(i)u_(i)=-1
By step deviation method,
"Mean"=a+hxx(1)/(N)xxsumf_(i)u_(i)
=0.10+0.04xx(1)/(30)xx(-1)
=0.10-(0.04)/(30)
=0.010-0.001=0.009 ppm