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

If the mean of a Poisson distribution is $\frac{1}{3}$,then the ratio $P(X=1) : P(X=2)$ is

In a meeting,$60 \%$ of the members favour and $40 \%$ oppose a certain proposal. $A$ member is selected at random. We define a random variable $X$ such that $X=0$ if the member opposes the proposal and $X=1$ if the member is in favour. Then,$\text{Var}(X) = $

If the probability density function (p.d.f.) of a continuous random variable $X$ is given by $f(x) = \begin{cases} k(9 + 8x - x^2), & \text{for } -1 \leq x \leq 4 \\ 0, & \text{otherwise} \end{cases}$, then the value of $k$ is:

$A$ man draws a card from a pack of $52$ playing cards,replaces it,and shuffles the pack. He continues this process until he gets a spade card. The probability that he will fail the first two times is:

$A$ random variable $X$ takes the values $0, 1, 2, 3, \dots$ with probability $P(X=x) = k(x+1)\left(\frac{1}{5}\right)^x$,where $k$ is a constant. 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