Let $X$ represent the difference between the number of heads and the number of tails obtained when a coin is tossed $6$ times. What are the possible values of $X$?

  • A
    $0, 2, 4, 6$
  • B
    $1, 2, 3, 4, 5, 6$
  • C
    $0, 1, 2, 3, 4, 5, 6$
  • D
    $2, 4, 6$

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$A$ random variable $X$ has the following distribution.
$X = x_{i}$$-2$$-1$$0$$1$$2$$3$
$P(X = x_{i})$$0.1$$k$$0.2$$2k$$3k$$k$

Then the variance of this distribution is

The probability distribution of a random variable $X$ is given by:
$X = x$$1$$2$$3$$4$
$P(X = x)$$1/10$$2/10$$3/10$$4/10$

Then the cumulative distribution function (c.d.f.) $F(x)$ of $X$ is given by:

If the probability distribution of a random variable $X$ is as follows,then the mean of $X$ is:
$X = x_i$$-1$$0$$1$$2$
$P(X = x_i)$$k^3$$2k^3 + k$$4k - 10k^2$$4k - 1$

State which of the following is not the probability distribution of a random variable. Give reasons for your answer.
$Z$ $3$ $2$ $1$ $0$ $-1$
$P(Z)$ $0.3$ $0.2$ $0.4$ $0.1$ $0.05$

$A$ coin is tossed until one head appears or a tail appears $4$ times in succession. The probability distribution of the number of tosses $X$ is:

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