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

Jan. Feb March April May June July Aug. Sept. Oct. Nov. Dec.

3 4 2 2 5 1 2 5 3 4 4 4

Find the probability that a student was born in August.

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Solution

The total number of trials is 40.

Remember the empirical or experimental or observed frequency approach to probability.

If n be the total number of trials of an experiment and A is an event associated to it such that A happens in m-trials. Then the empirical probability of happening of event A is denoted byand is given by

Let A₁ be the event that the birth month of a chosen student is august.

The number of times A₁ happens is 5.

Therefore, we have

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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.

Q. The table given below shows the month of birth of 36 students of a class.

Month of birth	Jan	Feb	Mar	Apr	May	June	July	Aug	Sept	Oct	Nov	Dec
No. of students	4	3	5	0	1	6	1	3	4	3	4	2

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}

(c)

\frac{1}{4}

(d)

\frac{1}{12}

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.

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.

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Jan.	Feb	March	April	May	June	July	Aug.	Sept.	Oct.	Nov.	Dec.
3	4	2	2	5	1	2	5	3	4	4	4

Following table shows the birth month of 40 students of class IX. Jan. Feb March April May June July Aug. Sept. Oct. Nov. Dec. 3 4 2 2 5 1 2 5 3 4 4 4 Find the probability that a student was born in August.

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

Jan. Feb March April May June July Aug. Sept. Oct. Nov. Dec.

3 4 2 2 5 1 2 5 3 4 4 4

Find the probability that a student was born in August.