Question 12
$\begin{matrix} C o n c e n t r a t i o n o f S O_{2} (i n p p m) & N u m b e r o f d a y s (f r e q u e n c y) 0.00 - 0.04 & 4 0.04 - 0.08 & 9 0.08 - 0.12 & 9 0.12 - 0.16 & 2 0.16 - 0.20 & 4 0.20 - 0.24 & 2 T o t a l & 30 \end{matrix}$
The above frequency distribution table represents the concentration of Sulphur dioxide in the air in parts per million of a certain city for 30 days. Using this table,
find the probability of the concentration of Sulphur dioxide in the interval 0.12−0.16 on any of these days.

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Solution

Total number of days =30
Number of days for which the concentration of Sulphur dioxide was in the interval of 0.12 −0.16= 2

$P (c o n c e n t r a t i o n o f S u l p h u r d i o x i d e i n t h e i n t e r v a l 0.12 - 0.16) = \frac{N u m b e r o f d a y s f o r w h i c h t h e c o n c e n t r a t i o n o f S u l p h u r d i o x i d e w a s i n t h e i n t e r v a l o f 0.12 - 0.16}{T o t a l n u m b e r o f d a y s}$
Hence, required probability, $P = \frac{2}{30} = \frac{1}{15}$

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Question 12
$\begin{matrix} {Concentration of SO}_{2} (in ppm) & Number of days (frequency) 0.00 - 0.04 & 4 0.04 - 0.08 & 9 0.08 - 0.12 & 9 0.12 - 0.16 & 2 0.16 - 0.20 & 4 0.20 - 0.24 & 2 Total & 30 \end{matrix}$
The above frequency distribution table represents the concentration of Sulphur dioxide in the air in parts per million of a certain city for 30 days. Using this table,
find the probability of the concentration of Sulphur dioxide in the interval 0.12−0.16 on any of these days.

Concentration of SO₂ (in ppm)	Number of days (frequency )
0.00 − 0.04	4
0.04 − 0.08	9
0.08 − 0.12	9
0.12 − 0.16	2
0.16 − 0.20	4
0.20 − 0.24	2
Total	30

The above frequency distribution table represents the concentration of sulphur dioxide in the air in parts per million of a certain city for 30 days. Using this table, find the probability of the concentration of sulphur dioxide in the interval 0.12 − 0.16 on any of these days.

Q. Given below is the frequency distribution table regarding the concentration of sulphur dioxide in the air in parts per million of a certain city for 30 days.

Conc. of SO₂	0.00-0.04	0.04-0.08	0.08-0.12	0.12-0.16	0.16-0.20	0.20-0.24
No. days:	4	8	9	2	4	3

Find the probability of concentration of sulphur dioxide in the interval
0.12-0.16 on any of these days.

Given below is the frequency distribution table regarding the concentration of sulphur dioxide in the air in parts per million of a certain city for 30 days.

$\begin{matrix} Conc. of S O_{2} & 0.00 - 0.04 & 0.04 - 0.08 & 0.08 - 0.12 & 0.12 - 0.16 & 0.16 - 0.20 & 0.20 - 0.24 No. of days & 4 & 8 & 9 & 2 & 4 & 3 \end{matrix}$

Find the probability of conentration of sulphur dioxide in the interval 0.12-0.16 on any of these days.

Q. 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:

\begin{matrix} 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 \end{matrix}

Using this table, find the probability of the concentration of sulphur dioxide in the interval

0.12 - 0.16

on any of these days.

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