Q. 74.2( 210 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

Answer :

The above given data can be represented in the form of table as below:

Mean can be calculated as follows:



where fi = frequency of ith class
and xi = middle point of ith class



= 0.099 ppm

Therefore, Mean concentration of SO2 in the air is 0.099 ppm
Assumed Mean method is not feasible for this question, because the values are too small and taking the steps will make the calculation tougher. Use Assumed mean or step deviation method when the values are larger and can be reduced with the help of steps.

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