Question

Question 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 (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?

Class 9 - Math - Statistics Page 245"

Answer 1

The concentration of So2 was more than for 8 days

Answer 2

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$\underline{\:\large{\sf Answer \: \textit{1} :}}$

$\begin{tabular}{|c|c|}\cline{1-2}\sf Concentration of Sulphur dioxide & \sf Frequency \\\cline{1-2}\sf0.00 - 0.04 &\sf 4 \\\cline{1-2}\sf 0.04 - 0.08 &\sf 9 \\\cline{1-2}\sf 0.08 - 0.12 & \sf 9 \\\cline{1-2}\sf0.12 - 0.16 & \sf2\\\cline{1-2}\sf 0.16 - 0.20 & \sf4\\\cline{1-2}\sf 0.20 - 0.24 & \sf2\\\cline{1-2}\sf Total & \sf30 \\\cline{1-2}\end{tabular}$⠀

$\underline{\:\large{\sf Answer \: \textit{2} :}}$

Total number of days where the concentration of sulphur dioxide more than 0.11 is :

• 0.12 - 0. 16
• 0.16 - 0.20
• 0.20 - 0.24

$\star\:\boxed{\sf{\purple{Total \ number \ of \ Days \ is \ 2 + 4 + 2 = 8 \ days.}}}$

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$\qquad\qquad\bigstar\:\underline{\textsf{Some More Information \: :}}$

• Statistics is used to collect any type of Data.

• Data is the collection of observations. There are different types of Data.

• In the statistics, Frequency is the representation of the number of occurrence of any event with the interval given.