5. 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

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

Answers (1)

Number of days where concentration of $\mathrm{SO}_{2}$  is more than 0.11
        = Number of days where concentration is in between 0.12-0.16
       + Number of days where concentration is in between 0.16-0.20
       + Number of days where concentration is in between 0.20-0.24
        \begin{array}{l} =2+4+2 \\ =8 \end{array}

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