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 million?

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Detailed Solution

(i) We draw the table of grouped frequency distribution with the class size as 0.04 for each class as follows,

so the total 30 days data is used to make the frequency distribution table

(ii) For the days having the concentration of sulphur dioxide more than 0.11 parts per million:

if we observe the above table then it is seen that,

The concentration is more than 0.11 for 8 days

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