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Question

A study was conducted to find out the concentration of sulphur dioxide in the air in parts per million (ppm) of a certain city. The data obtained for 30 days is as follows:
0.030.080.080.090.040.170.160.050.020.060.180.200.110.080.120.130.220.070.080.010.100.060.090.180.110.070.050.070.010.04

(i) Make a grouped frequency distribution table for this data with class intervals as 0.000.04,0.040.08, and so on.
(ii) For how many days, was the concentration of sulphur dioxide more than 0.11 parts per million?

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Solution

Concentration of
sulphur dioxide (in ppm)
Frequency
0.00 - 0.04 4
0.04 - 0.08 9
0.08 - 0.12 9
0.12 - 0.162
0.16 - 0.20 4
0.20 - 0.24 2
Total 30
(i) The figure above is the grouped frequency distribution.
(ii) The number of days for which concentration of SO2 is more than 0.110.120.16,0.160.20,0.200.24
Total number of days =2+4+2=8 days.

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