To find out the concentration of So, 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 of So, in ppm)
Frequency
11
0.00 - 0.04
4
0.04 - 0.08
9
0.08 - 0.12
9
0.12 - 0.16
2
4
0.16 - 0.20
2.
0.20 - 0.24
Find the mean concentration of So, in the air.
Answers
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Answer:
Answer:-
Concentration of SO
2
(in ppm) x
i
Frequency
(f
i
) f
i
x
i
0.00-0.04 0.02 4 0.08
0.04-0.08 0.06 9 0.54
0.08-0.12 0.10 9 0.90
0.12-0.16 0.14 2 0.28
0.16-0.20 0.18 4 0.72
0.20-0.24 0.22 2 0.44
Σf
i
=30 Σf
i
x
i
=2.96
mean concentration of SO
2
in the air=
Σf
i
Σf
i
x
i
=
30
2.96
=0.0986≈0.099
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