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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: (ii) For how many days

Q. 5.     A study was conducted to find out the concentration of sulphur dioxide in the air inparts 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

         (ii) For how many days, was the concentration of sulphur dioxide more than 0.11 parts per million?

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S Sayak

From the frequency distribution table, we can see the concentration of sulphur dioxide was more than 0.11 ppm for 8 days.

It was in the range 0.12 - 0.16 for 2 days, 0.16 - 0.20 for 4 days and 0.20 - 0.24 for 2 days.

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