The following table shows the birth month of 40 students of class IX.

$\begin{matrix} J a n . & F e b . & M a r c h & A p r i l & M a y & J u n e & J u l y & A u g . & S e p t . & O c t . & N o v . & D e c . 3 & 4 & 2 & 2 & 5 & 1 & 2 & 6 & 3 & 4 & 4 & 4 \end{matrix}$

Find the probability that a student was born in August.

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Solution

Total number of students (n) = 40

$\begin{matrix} J a n . & F e b . & M a r c h & A p r i l & M a y & J u n e & J u l y & A u g . & S e p t . & O c t . & N o v . & D e c . 3 & 4 & 2 & 2 & 5 & 1 & 2 & 6 & 3 & 4 & 4 & 4 \end{matrix}$

Total number of students born in August (m) = 6

$∴$ Required probability = $\frac{m}{n} = \frac{6}{40} = \frac{3}{20}$

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Q. In a particular section of Class IX, 40 students were asked about the months of their birth and the following graph was prepared for the data so obtained:

Find the probability that a student of the class was born in August.

Question 3
In a particular section of Class IX, 40 students were asked about the months of their birth and the following graph was prepared for the data so obtained:

Find the probability that a student of the class was born in August.

Following table shows the birh month of 40 students of class IX.

$\begin{matrix} J a n . & F e b . & M a r c h & A p r i l & M a y & J u n e & J u l y & A u g . & S e p t . & O c t . & N o v . & D e c . 3 & 4 & 2 & 2 & 5 & 1 & 2 & 6 & 3 & 4 & 4 & 4 \end{matrix}$

Find the probability that a student was born in August.

Question 3
In a particular section of Class IX, 40 students were asked about the months of their birth and the following graph was prepared for the data so obtained:

Find the probability that a student of the class was born in August.

The table given below shows the months of birth of 36 students of a class:

$\begin{matrix} Month of birth & Jan. & Feb. & March & April & May & June & July & Aug. & Sept. & Oct. & Nov. & Dec. No. of students & 4 & 3 & 5 & 0 & 1 & 6 & 1 & 3 & 4 & 3 & 4 & 2 \end{matrix}$

A student is chosen at random from the class. What is the probability that the chosen student was born in October?

(a) $\frac{1}{3}$

(b) $\frac{2}{3}$

(d) $\frac{1}{12}$

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The following table shows the birth month of 40 students of class IX. Jan.Feb.MarchAprilMayJuneJulyAug.Sept.Oct.Nov.Dec.342251263444 Find the probability that a student was born in August.

Total number of students (n) = 40 Jan.Feb.MarchAprilMayJuneJulyAug.Sept.Oct.Nov.Dec.342251263444 Total number of students born in August (m) = 6 ∴ Required probability =mn=640=320