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

AcademicMathematicsNCERTClass 9

Given:

A study was conducted to find out the concentration of sulphur dioxide in the air in parts per million (ppm) of a certain city. 

To do:

We have to 

(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) Find the number of days on which concentration of sulphur dioxide was more than \( 0.11 \) parts per million.

Solution:

(i) The given data is large, so we construct a grouped frequency distribution table of class size 0.04.

This implies,

The class intervals are 0.00 - 0.04, 0.04 - 0.08 and so on.

The data is represented in the grouped frequency distribution table as follows:

Concentration of $SO_2$ (in ppm)Frequency
0.00-0.044
0.04-0.089
0.08-0.129
0.12-0.162
0.16-0.204
0.20-0.24

2

Total30

(ii) The number of days in which the concentration of sulphur dioxide was more than $0.11$ parts per million $= 2+4+ 2$

$= 8$

raja
Updated on 10-Oct-2022 13:47:02

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