$A$ fair die is tossed twice in succession. If $X$ denotes the number of fours in $2$ tosses,then the probability distribution of $X$ is given by

  • A
    $X = x_i$$0$$1$$2$
    $P_i$$\frac{1}{36}$$\frac{25}{36}$$\frac{5}{18}$
  • B
    $X = x_i$$0$$1$$2$
    $P_i$$\frac{25}{36}$$\frac{1}{36}$$\frac{5}{18}$
  • C
    $X = x_i$$0$$1$$2$
    $P_i$$\frac{25}{36}$$\frac{5}{18}$$\frac{1}{36}$
  • D
    $X = x_i$$0$$1$$2$
    $P_i$$\frac{5}{18}$$\frac{1}{36}$$\frac{25}{36}$

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The p.m.f. of a random variable $X$ is $P(x) = \begin{cases} \frac{2x}{n(n+1)}, & x = 1, 2, 3, \ldots, n \\ 0, & \text{otherwise} \end{cases}$,then $E(X)$ is

Which of the following can not be a valid assignment of probabilities for outcomes of sample space $S = \{\omega_{1}, \omega_{2}, \omega_{3}, \omega_{4}, \omega_{5}, \omega_{6}, \omega_{7}\}$?
OutcomeProbability
$\omega_{1}$$0.1$
$\omega_{2}$$0.01$
$\omega_{3}$$0.05$
$\omega_{4}$$0.03$
$\omega_{5}$$0.01$
$\omega_{6}$$0.2$
$\omega_{7}$$0.6$

If $X$ is a random variable with cumulative distribution function $F(x)$ and its probability distribution is given by the following table:
$X = x$$-1.5$$-0.5$$0.5$$1.5$$2.5$
$P(X = x)$$0.05$$0.2$$0.15$$0.25$$0.35$

Then,find the value of $F(1.5) - F(-0.5)$.

Let a sample space be $S = \{\omega_{1}, \omega_{2}, \dots, \omega_{6}\}$. Which of the following assignments of probabilities to each outcome is valid?
Outcome$\omega_1$$\omega_2$$\omega_3$$\omega_4$$\omega_5$$\omega_6$
$(e)$$0.1$$0.2$$0.3$$0.4$$0.5$$0.6$

If a random variable $X$ follows a Poisson distribution with a mean value of $5$,then the probability that $X < 3$ is:

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