Question

To find out the concentration of  SO_2SO2​  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

Concentration (in ppm)0.040.04-0.080.080.080.08-0.120.120.120.12-0.160.160.160.16-0.20.20.20.2-0.240.240.240.24-0.280.28Frequency4,6,6,4,6,4​

Answer 1

Step-by-step explanation:

Concentration

of SO2 (in ppm) Class Interval No.oflocalitieFrequency(Fi) ClassMarks (Xi) FiXi

0.00-0.04 4 0.02 0.08

0.04-0.08. 9 0.06 0.54

0.08-0.12. 9 0.1 0.9

0.12-0.16. 2 0.14 0.28

0.16-0.20. 4. 0.18 0.72

0.20-0.24 2 0.22 0.44

Total 30 no 2.96

MeanconcentrationofSO

2

inair=

∑f

i

∑f

i

x

i

=

30

2.96

=0.09866=0.099