$A$ random variable $X$ has the probability distribution as given below. Let $E = \{X \mid X \text{ is a prime number}\}$ and $F = \{X \mid X < 4\}$,then $P(E \cup F) = $
$\begin{array}{|c|c|c|c|c|c|c|c|c|} \hline X & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\ \hline P(X) & K & 2K & K^2 & 2K^2 & 5K^2 & K & K & 2K \\ \hline \end{array}$
$\begin{array}{|c|c|c|c|c|c|c|c|c|} \hline X & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\ \hline P(X) & K & 2K & K^2 & 2K^2 & 5K^2 & K & K & 2K \\ \hline \end{array}$
- A$\frac{38}{64}$
- B$\frac{39}{64}$
- C$\frac{42}{64}$
- D$\frac{17}{64}$
Explore More
Similar Questions
The p.m.f of a random variable $X$ is given by $P(X) = \frac{2x}{n(n+1)}$ for $x = 1, 2, 3, \ldots, n$,and $0$ otherwise. Then $E(X) = $
The probability distribution of a random variable $X$ is given below. Then,the standard deviation of $X$ is
$X=x_i$ $2$ $3$ $5$ $7$ $12$ $P(X=x_i)$ $3k$ $k$ $k$ $2k$ $k$
| $X=x_i$ | $2$ | $3$ | $5$ | $7$ | $12$ |
|---|---|---|---|---|---|
| $P(X=x_i)$ | $3k$ | $k$ | $k$ | $2k$ | $k$ |
If a variable takes values $0, 1, 2, ..., n$ with frequencies proportional to the binomial coefficients $^nC_0, ^nC_1, ..., ^nC_n$,find the mean of the distribution.
Difficult
View SolutionThe probability distribution of a discrete random variable $X$ is given by the following table:
$X = x$ $0$ $1$ $2$ $3$ $4$ $P(X = x)$ $k$ $2k$ $4k$ $2k$ $k$
Then the value of $P(X \leq 2)$ is:
| $X = x$ | $0$ | $1$ | $2$ | $3$ | $4$ |
| $P(X = x)$ | $k$ | $2k$ | $4k$ | $2k$ | $k$ |
Then the value of $P(X \leq 2)$ is:
The distribution of a random variable $X$ is given below. The value of $k$ is:
$X = x$ $-2$ $-1$ $0$ $1$ $2$ $3$ $P(X = x)$ $\frac{1}{10}$ $k$ $\frac{1}{5}$ $2k$ $\frac{3}{10}$ $k$
| $X = x$ | $-2$ | $-1$ | $0$ | $1$ | $2$ | $3$ |
| $P(X = x)$ | $\frac{1}{10}$ | $k$ | $\frac{1}{5}$ | $2k$ | $\frac{3}{10}$ | $k$ |
Vedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo