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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,
`=0.010-0.001=0.009` ppm

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