Find the probability distribution of the number of successes in two tosses of a die,where a success is defined as a number greater than $4$.

Vedclass pdf generator app on play store
Vedclass iOS app on app store
(A) When a die is tossed two times,the total number of possible outcomes is $6 \times 6 = 36$.
Let $X$ be the random variable representing the number of successes.
$A$ success is defined as obtaining a number greater than $4$ (i.e.,$5$ or $6$).
The probability of success in a single toss is $p = \frac{2}{6} = \frac{1}{3}$.
The probability of failure in a single toss is $q = 1 - p = 1 - \frac{1}{3} = \frac{2}{3}$.
$X$ can take values $0, 1, 2$.
$P(X=0) = q \times q = \frac{2}{3} \times \frac{2}{3} = \frac{4}{9}$.
$P(X=1) = (p \times q) + (q \times p) = (\frac{1}{3} \times \frac{2}{3}) + (\frac{2}{3} \times \frac{1}{3}) = \frac{2}{9} + \frac{2}{9} = \frac{4}{9}$.
$P(X=2) = p \times p = \frac{1}{3} \times \frac{1}{3} = \frac{1}{9}$.
The probability distribution is:
$X$ $0$ $1$ $2$
$P(X)$ $\frac{4}{9}$ $\frac{4}{9}$ $\frac{1}{9}$

Explore More

Similar Questions

Suppose that two cards are drawn at random from a deck of cards. Let $X$ be the number of aces obtained. Then the value of $E(X)$ is

Difficult
View Solution

$A$ bakerman sells $5$ types of cakes. Profit due to sale of each type of cake is respectively $Rs \ 2$,$Rs \ 2.5$,$Rs \ 3$,$Rs \ 1.5$ and $Rs \ 1$. The demands for these cakes are $20 \%$,$5 \%$,$10 \%$,$50 \%$ and $15 \%$ respectively. Then the expected profit per cake is:

$A$ box contains $8$ batteries, of which $3$ are defective. If a person randomly selects $2$ batteries from this box, find the probability distribution of the number of defective batteries $X$.

If $X$ is a random variable such that $P(X=-2)=P(X=-1)=P(X=2)=P(X=1)=\frac{1}{6}$ and $P(X=0)=\frac{1}{3}$,then the mean of $X$ is

$A$ random variable $X$ takes the values $0, 1, 2, 3$ and its mean is $1.3$. If $P(X=3)=2 P(X=1)$ and $P(X=2)=0.3$,then $P(X=0)$ is

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial
For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free
For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo