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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

(i) Make a grouped frequency distribution table for this data with class intervals as 0.00 – 0.04, 0.04 – 0.08, and so on. 

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

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(i) Grouped frequency distribution table:

(ii) In 8 days the concentration of sulphur dioxide is more than 0.11 parts per million.

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