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.0.03 0.08 0.08 0.09 0.04 0.17
0.16 0.05 0.02 0.06 0.18 0.20
0.11 0.08 0.12 0.13 0.22 0.07
0.08 0.01 0.10 0.06 0.09 0.18
0.11 0.07 0.05 0.07 0.01 0.04
For how many days, was the concentration of sulphur dioxide more than 0.11 parts per million?
0.16 0.05 0.02 0.06 0.18 0.20
0.11 0.08 0.12 0.13 0.22 0.07
0.08 0.01 0.10 0.06 0.09 0.18
0.11 0.07 0.05 0.07 0.01 0.04
For how many days, was the concentration of sulphur dioxide more than 0.11 parts per million?
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Solution:Data obtained for 30 days
0.03 0.08 0.08 0.09 0.04 0.17
0.16 0.05 0.02 0.06 0.18 0.20
0.11 0.08 0.12 0.13 0.22 0.07
0.08 0.01 0.10 0.06 0.09 0.18
0.11 0.07 0.05 0.07 0.01 0.04
Grouped the data for easy calculation (0.01-0.05) 0.05 not included
Group _________frequency
0.01-0.05__________6
0.05-0.10__________13
0.10-0.15___________5
0.15-0.20__________4
0.20-0.25__________2
Now,we can easily check for how many days
concentration of sulphur dioxide more than 0.11
parts per million?
Answer: 8 days
from class 0.10-0.15 we exclude 3 values namely 0.10,0.11 and 0.11
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