The distribution of a random variable $X$ is given below. The value of $k$ is:
$X = x$ $-2$ $-1$ $0$ $1$ $2$ $3$ $P(X = x)$ $\frac{1}{10}$ $k$ $\frac{1}{5}$ $2k$ $\frac{3}{10}$ $k$
| $X = x$ | $-2$ | $-1$ | $0$ | $1$ | $2$ | $3$ |
| $P(X = x)$ | $\frac{1}{10}$ | $k$ | $\frac{1}{5}$ | $2k$ | $\frac{3}{10}$ | $k$ |
- A$\frac{1}{10}$
- B$\frac{2}{10}$
- C$\frac{3}{10}$
- D$\frac{7}{10}$
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Similar Questions
$A$ random variable $X$ has the following probability distribution:
$X$ $0$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $P(X)$ $0$ $2p$ $2p$ $3p$ $p^2$ $2p^2$ $7p^2$ $2p$
The value of $p$ is:
| $X$ | $0$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ |
|---|---|---|---|---|---|---|---|---|
| $P(X)$ | $0$ | $2p$ | $2p$ | $3p$ | $p^2$ | $2p^2$ | $7p^2$ | $2p$ |
The value of $p$ is:
Two cards are drawn simultaneously from a well-shuffled pack of $52$ cards. If $X$ is the random variable representing the number of queens obtained,then the value of $2 E(X) + 3 E(X^2)$ is:
Two cards are drawn at random from a box which contains $5$ cards numbered $1, 1, 2, 2, 3$. If $X$ denotes the sum of the numbers on the two cards, then the expected value of $X$ is...
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View Solution$A$ biased coin with probability $p, 0 < p < 1,$ of heads is tossed until a head appears for the first time. If the probability that the number of tosses required is even is $\frac{2}{5},$ then $p = $
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