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A study was conducted to find out the co...

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 :
For how many days, was the concentra-tion ofsulphur dioxide more than 0.11 parts per million.

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The correct Answer is:
than 0.11 ppm for 8 days
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